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Open-Access Journal
Review
Ming-Ke Wang, Hai-Yan Yue, Jin Cai, Yu-Jia Zhai, Jian-Hui Peng, Ju-Fen Hui, Deng-Yong Hou, Wei-Peng Li, Ji-Shun Yang 
World J Clin Cases 9(16):3796-3813. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.3796
Minireviews
Liliana Baroiu, Caterina Dumitru, Alina Iancu, Ana-Cristina Leșe, Miruna Drăgănescu, Nicușor Baroiu, Lucreția Anghel 
World J Clin Cases 9(16):3814-3825. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.3814
Case Control Study
Retrospective Study
Xiao-Wen Wu, Xu-Ya Zhao, Xing Li, Jun-Xiang Li, Zong-Yang Liu, Zhi Huang, Ling Zhang, Chong-Yang Sima, Yu Huang, Lei Chen, Shi Zhou 
World J Clin Cases 9(16):3848-3857. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.3848
Observational Study
Randomized Clinical Trial
Case Report
Sven Flemming, Johan F Lock, Mohammed Hankir, Stanislaus Reimer, Bernhard Petritsch, Christoph-Thomas Germer, Florian Seyfried 
World J Clin Cases 9(16):3971-3978. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.3971
Anca Cristina Drăgănescu, Oana Săndulescu, Anuța Bilașco, Camelia Kouris, Anca Streinu-Cercel, Monica Luminos, Adrian Streinu-Cercel 
World J Clin Cases 9(16):4032-4039. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.4032
Feng-He Min, Jia Li, Bo-Qiang Tao, Hui-Min Liu, Zhi-Jing Yang, Lu Chang, Yu-Yang Li, Ying-Kun Liu, Yi-Wen Qin, Wei-Wei Liu 
World J Clin Cases 9(16):4052-4062. Published online Jun 6, 2021. doi: 10.12998/wjcc.v9.i16.4052