<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ssmu</journal-id><journal-title-group><journal-title xml:lang="ru">Бюллетень сибирской медицины</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Siberian Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1682-0363</issn><issn pub-type="epub">1819-3684</issn><publisher><publisher-name>Siberian State Medical University, the Ministry of Healthcare of the Russian Federation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20538/1682-0363-2023-4-100-106</article-id><article-id custom-type="elpub" pub-id-type="custom">ssmu-5424</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL PAPERS</subject></subj-group></article-categories><title-group><article-title>Взаимосвязь делеций генов CDKN2A и CDKN2B с выживаемостью больных диффузной В-крупноклеточной лимфомой</article-title><trans-title-group xml:lang="en"><trans-title>Association of CDKN2A/B deletions with survival of patients with diffuse large B-cell lymphoma</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5949-7865</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сарпова</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sarpova</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сарпова Мария Вадимовна – науч. сотрудник, лаборатория патоморфологии</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">marisarpova@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1897-6936</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Трегубова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tregubova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Трегубова Екатерина Владимировна – мл. науч. сотрудник, лаборатория клеточной и молекулярной иммунологии</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">tregubova.e@bk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8688-1344</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дьяконов</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Diakonov</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дьяконов Дмитрий Андреевич – канд. мед. наук, зав. лабораторией патоморфологии</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">dyakonov@niigpk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1045-2011</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ванеева</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vaneeva</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ванеева Елена Викторовна – канд. биол. наук, науч. сотрудник лаборатории патоморфологии ФГБУН </p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">vaneeva@niigpk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2054-2870</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Росин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rosin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Росин Виталий Анатольевич – канд. мед. наук, ст. науч. сотрудник, лаборатория патоморфологии</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">rosin@niigpk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8639-719X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Самарина</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Samarina</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Самарина Светлана Валерьевна – канд. мед. наук, зав. клинико-диагностическим отделением гематологии и химиотерапии с дневным стационаром</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">samarina@niigpk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2010-8679</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Назарова</surname><given-names>Е. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Nazarova</surname><given-names>E. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Назарова Елена Львовна – канд. мед. наук, зав. лабораторией клеточной и молекулярной иммунологии</p><p>610027, г. Киров, ул. Красноармейская, 72</p></bio><bio xml:lang="en"><p>72, Krasnoarmeyskaya Str., Kirov, 610027</p></bio><email xlink:type="simple">nazarova.yelena@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Кировский научно-исследовательский институт гематологии и переливания крови Федерального медико-биологического агентства» (КНИИГиПК ФМБА)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kirov Research Institute of Hematology and Blood Transfusion of the Federal Medical Biological Agency (KRIHBT)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>23</day><month>01</month><year>2024</year></pub-date><volume>22</volume><issue>4</issue><fpage>100</fpage><lpage>106</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сарпова М.В., Трегубова Е.В., Дьяконов Д.А., Ванеева Е.В., Росин В.А., Самарина С.В., Назарова Е.Л., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Сарпова М.В., Трегубова Е.В., Дьяконов Д.А., Ванеева Е.В., Росин В.А., Самарина С.В., Назарова Е.Л.</copyright-holder><copyright-holder xml:lang="en">Sarpova M.V., Tregubova E.V., Diakonov D.A., Vaneeva E.V., Rosin V.A., Samarina S.V., Nazarova E.L.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://bulletin.ssmu.ru/jour/article/view/5424">https://bulletin.ssmu.ru/jour/article/view/5424</self-uri><abstract><sec><title>Цель</title><p>Цель. Определить взаимосвязь делеций генов CDKN2A и CDKN2B в локусе 9р21 с выживаемостью больных диффузной В-крупноклеточной лимфомой.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. В исследование включены 105 пациентов с диффузной В-крупноклеточной лимфомой, получавших терапию первой линии по схеме R-CHOP. Делецию 9р21 выявляли с помощью флуоресцентной гибридизации in situ биопсийных образцов опухолевой ткани. Делеции в генах CDKN2A и CDKN2B устанавливали количественной полимеразной цепной реакцией в реальном времени. Общую и беспрогрессивную выживаемость рассчитывали по методу Каплана – Мейера с графическим построением кривых (log-rank тест). Риск наступления события вычисляли методом регрессионного анализа Кокса с расчетом отношения рисков (ОР) и 95%-го доверительного интервала (95%-й ДИ). Различия между показателями считали статистически значимыми при p &lt; 0,05.</p></sec><sec><title>Результаты</title><p>Результаты. Делеция хромосомного региона 9р21 обнаружена в биопсийных образцах 16,2% больных. Поломки в гене CDKN2A выявлены у 23,8% пациентов, утрата CDKN2B –у 28,6%. Беспрогрессивная выживаемость значимо ниже у обследованных с делецией 9р21, чем у лиц без данной аберрации: 29,4% против 62,5% соответственно (р = 0,012; ОР = 2,26; 95%-й ДИ = 1,17–4,38). Риск прогрессии заболевания при низком и низком промежуточном показателе международного прогностического индекса в 5,9 раза выше у пациентов с делецией гена CDKN2B, чем у больных без указанной аномалии.</p></sec><sec><title>Заключение</title><p>Заключение. Делеция хромосомного региона 9р21 связана с низкой беспрогрессивной выживаемостью больных диффузной В-крупноклеточной лимфомой. Утрата гена CDKN2B ассоциирована с высоким риском прогрессии заболевания у пациентов низкого и низкого промежуточного риска согласно международному прогностическому индексу.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Aim</title><p>Aim. To define the association of CDKN2A/B deletions in the 9p21 locus with survival of patients with diffuse large B-cell lymphoma.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The study included 105 patients with diffuse large B-cell lymphoma who received firstline therapy with R-CHOP. A deletion of 9p21 was detected by fluorescent in situ hybridization of tumor tissue biopsy samples. Deletions of CDKN2A and CDKN2B were determined by real-time quantitative polymerase chain reaction. The overall survival and the progression-free survival were calculated by the Kaplan – Meier method with plotting of survival curves (the log-rank test). The risk of event occurrence was determined by the Cox regression analysis with the calculation of the risk ratio (RR) and 95% confidence interval (CI). The differences between the variables were considered statistically significant at p &lt; 0.05.</p></sec><sec><title>Results</title><p>Results. The deletion of the chromosomal region 9p21 was detected in the biopsy samples in 16.2% of patients. The CDKN2A deletions were detected in 23.8% of patients and CDKN2B loss – in 28.6% of patients. The progressionfree survival was significantly lower in patients with the 9p21 deletion than in those without this aberration: 29.4% vs. 62.5%, respectively (p = 0.012; RR = 2.26; 95% CI = 1.17–4.38). The risk of disease progression at low and low-intermediate values of the International Prognostic Index was 5.9 times higher in patients with the CDKN2B deletion than in patients without this abnormality.</p></sec><sec><title>Conclusion</title><p>Conclusion. Deletion of the chromosomal region 9p21 is associated with low progression-free survival in patients with diffuse large B-cell lymphoma. Loss of CDKN2B is associated with a high risk of disease progression in patients with low and low-intermediate risk according to the International Prognostic Index.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>делеция локуса 9р21</kwd><kwd>диффузная В-крупноклеточная лимфома</kwd><kwd>CDKN2A/В</kwd></kwd-group><kwd-group xml:lang="en"><kwd>deletion of the 9p21 locus</kwd><kwd>diffuse large B-cell lymphoma</kwd><kwd>CDKN2A/B</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Alaggio R., Amador C., Anagnostopoulos I., Attygalle A.D., Barreto de Oliveira Araujo I., Berti E. et al. The 5th edition of the World Health Organization classification of haematolymphoid tumours: lymphoid neoplasms. Leukemia. 2022;36(7):1720–1748. DOI: 10.1038/s41375-022-01620-2.</mixed-citation><mixed-citation xml:lang="en">Alaggio R., Amador C., Anagnostopoulos I., Attygalle A.D., Barreto de Oliveira Araujo I., Berti E. et al. The 5th edition of the World Health Organization classification of haematolymphoid tumours: lymphoid neoplasms. Leukemia. 2022;36(7):1720–1748. DOI: 10.1038/s41375-022-01620-2.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Coiffier B., Sarkozy C. Diffuse large B-cell lymphoma: R-CHOP failure – what to do? Hematology Am. Soc. Hematol. Educ. Program. 2016;2016(1):366–378. DOI: 10.1182/asheducation-2016.1.366.</mixed-citation><mixed-citation xml:lang="en">Coiffier B., Sarkozy C. Diffuse large B-cell lymphoma: R-CHOP failure – what to do? Hematology Am. Soc. Hematol. Educ. Program. 2016;2016(1):366–378. DOI: 10.1182/asheducation-2016.1.366.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Самарина С.В., Назарова Е.Л., Минаева Н.В., Зотина Е.Н., Парамонов И.В., Грицаев С.В. Клинико-гематологические показатели прогноза ответа на терапию первой линии у пациентов с диффузной В-крупноклеточной лимфомой. Клиническая онкогематология. 2019;12(1):68–72. DOI: 10.21320/2500-2139-2019-12-1-68-72.</mixed-citation><mixed-citation xml:lang="en">Самарина С.В., Назарова Е.Л., Минаева Н.В., Зотина Е.Н., Парамонов И.В., Грицаев С.В. Клинико-гематологические показатели прогноза ответа на терапию первой линии у пациентов с диффузной В-крупноклеточной лимфомой. Клиническая онкогематология. 2019;12(1):68–72. DOI: 10.21320/2500-2139-2019-12-1-68-72.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Alizadeh A., Eisen M., Davis R., Ma C., Lossos I.S., Rosenwald A. et al. Distinct types of diffuse large B-cell lymphoma identified by gene expression profiling. Nature. 2000;403(6769):503–511. DOI: 10.1038/35000501.</mixed-citation><mixed-citation xml:lang="en">Alizadeh A., Eisen M., Davis R., Ma C., Lossos I.S., Rosenwald A. et al. Distinct types of diffuse large B-cell lymphoma identified by gene expression profiling. Nature. 2000;403(6769):503–511. DOI: 10.1038/35000501.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Ванеева Е.В., Росин В.А., Дьяконов Д.А., Лучинин А.С., Кочетов Н.Л., Самарина С.В. Значение экспрессии рАКТ1 при диффузной В-крупноклеточной лимфоме. Бюллетень сибирской медицины. 2021;20(3):6–13. DOI: 10.20538/1682-0363-2021-3-13-20.</mixed-citation><mixed-citation xml:lang="en">Ванеева Е.В., Росин В.А., Дьяконов Д.А., Лучинин А.С., Кочетов Н.Л., Самарина С.В. Значение экспрессии рАКТ1 при диффузной В-крупноклеточной лимфоме. Бюллетень сибирской медицины. 2021;20(3):6–13. DOI: 10.20538/1682-0363-2021-3-13-20.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Wright G.W., Huang D.W., Phelan J.D., Coulibaly Z.A., Roulland S., Young R.M. et al. A probabilistic classification tool for genetic subtypes of diffuse large B-cell lymphoma with therapeutic implications. Cancer Cell. 2020;37(4):551–568.e14. DOI: 10.1016/j.ccell.2020.03.015.</mixed-citation><mixed-citation xml:lang="en">Wright G.W., Huang D.W., Phelan J.D., Coulibaly Z.A., Roulland S., Young R.M. et al. A probabilistic classification tool for genetic subtypes of diffuse large B-cell lymphoma with therapeutic implications. Cancer Cell. 2020;37(4):551–568.e14. DOI: 10.1016/j.ccell.2020.03.015.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Chapuy B., Stewart C., Dunford A.J., Kim J., Kamburov A., Redd R.A. et al. Molecular subtypes of diffuse large B-cell lymphoma are associated with distinct pathogenic mechanisms and outcomes. Nat. Med. 2018;24(5):679–690. DOI: 10.1038/s41591-018-0016-8.</mixed-citation><mixed-citation xml:lang="en">Chapuy B., Stewart C., Dunford A.J., Kim J., Kamburov A., Redd R.A. et al. Molecular subtypes of diffuse large B-cell lymphoma are associated with distinct pathogenic mechanisms and outcomes. Nat. Med. 2018;24(5):679–690. DOI: 10.1038/s41591-018-0016-8.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Li J., Poi M.J., Tsai M.D. Regulatory mechanisms of tumor suppressor P16(INK4A) and their relevance to cancer. Biochemistry. 2011;50(25):5566–5582. DOI: 10.1021/bi200642e.</mixed-citation><mixed-citation xml:lang="en">Li J., Poi M.J., Tsai M.D. Regulatory mechanisms of tumor suppressor P16(INK4A) and their relevance to cancer. Biochemistry. 2011;50(25):5566–5582. DOI: 10.1021/bi200642e.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Jardin F., Jais J.P., Molina T.J., Parmentier F., Picquenot J.M., Ruminy P. et al. Diffuse large B-cell lymphomas with CDKN2A deletion have a distinct gene expression signature and a poor prognosis under R-CHOP treatment: a GELA study. Blood. 2010;116(7):1092–1094. DOI: 10.1182/blood-2009-10-247122.</mixed-citation><mixed-citation xml:lang="en">Jardin F., Jais J.P., Molina T.J., Parmentier F., Picquenot J.M., Ruminy P. et al. Diffuse large B-cell lymphomas with CDKN2A deletion have a distinct gene expression signature and a poor prognosis under R-CHOP treatment: a GELA study. Blood. 2010;116(7):1092–1094. DOI: 10.1182/blood-2009-10-247122.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Hans C.P., Weisenburger D.D., Greiner T.C., Gascoyne R.D., Delabie J., Ott G. et al. Confirmation of the molecular classification of diffuse large B-cell lymphoma by immunohistochemistry using a tissue microarray. Blood. 2004;103(1):275– 282. DOI: 10.1182/blood-2003-05-1545.</mixed-citation><mixed-citation xml:lang="en">Hans C.P., Weisenburger D.D., Greiner T.C., Gascoyne R.D., Delabie J., Ott G. et al. Confirmation of the molecular classification of diffuse large B-cell lymphoma by immunohistochemistry using a tissue microarray. Blood. 2004;103(1):275– 282. DOI: 10.1182/blood-2003-05-1545.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Laharanne E., Chevret Y., Idrissi Y., Gentil C., Longy M., Ferrer J. et al. CDKN2A-CDKN2B deletion defines an aggressive subset of cutaneous T-cell lymphoma. Modern Pathology. 2010;23(4):547–558. DOI: 10.1038/modpathol.2009.196.</mixed-citation><mixed-citation xml:lang="en">Laharanne E., Chevret Y., Idrissi Y., Gentil C., Longy M., Ferrer J. et al. CDKN2A-CDKN2B deletion defines an aggressive subset of cutaneous T-cell lymphoma. Modern Pathology. 2010;23(4):547–558. DOI: 10.1038/modpathol.2009.196.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Bolen C.R., Klanova M., Trneny M., Sehn L.H., He J., Tong J. et al. Prognostic impact of somatic mutations in diffuse large B-cell lymphoma and relationship to cell-of-origin: data from the phase III GOYA study. Haematologica. 2020;105(9):2298– 2307. DOI: 10.3324/haematol.2019.227892.</mixed-citation><mixed-citation xml:lang="en">Bolen C.R., Klanova M., Trneny M., Sehn L.H., He J., Tong J. et al. Prognostic impact of somatic mutations in diffuse large B-cell lymphoma and relationship to cell-of-origin: data from the phase III GOYA study. Haematologica. 2020;105(9):2298– 2307. DOI: 10.3324/haematol.2019.227892.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Karube K., Enjuanes A., Dlouhy I., Jares P., Martin-Garcia D., Nadeu F. et al. Integrating genomic alterations in diffuse large B-cell lymphoma identifies new relevant pathways and potential therapeutic targets. Leukemia. 2018;32(3):675–684. DOI: 10.1038/leu.2017.251.</mixed-citation><mixed-citation xml:lang="en">Karube K., Enjuanes A., Dlouhy I., Jares P., Martin-Garcia D., Nadeu F. et al. Integrating genomic alterations in diffuse large B-cell lymphoma identifies new relevant pathways and potential therapeutic targets. Leukemia. 2018;32(3):675–684. DOI: 10.1038/leu.2017.251.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
