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Open-Access Journal
Frontier
Review
Minireviews
Yu-Wen Cai, Fang-Fen Dong, Yu-Heng Shi, Li-Yuan Lu, Chen Chen, Ping Lin, Yu-Shan Xue, Jian-Hua Chen, Su-Yu Chen, Xiong-Biao Luo 
World J Clin Cases 9(31):9376-9385. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9376
Case Control Study
Retrospective Cohort Study
Bogdan Cucuteanu, Dragoş Negru, Otilia Gavrilescu, Iolanda Valentina Popa, Mariana Floria, Cătălina Mihai, Cristina Cijevschi Prelipcean, Mihaela Dranga 
World J Clin Cases 9(31):9395-9405. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9395
Retrospective Study
Observational Study
Cláudia N Montemor, Marcos Tadeu P Fernandes, Audrey S Marquez, Regina Célia Poli-Frederico, Rubens Alexandre da Silva, Karen B P Fernandes 
World J Clin Cases 9(31):9491-9499. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9491
Meta-Analysis
Case Report
Hong-Ming Liu, Guang-Heng Luo, Xiao-Fei Yang, Zhu-Gang Chu, Tian Ye, Zhi-Yong Su, Li Kai, Xiu-Shu Yang, Zhen Wang 
World J Clin Cases 9(31):9584-9591. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9584
Xiang Wu, Jun Luo, Fei Wu, Neng Li, Ai-Qiong Tang, Ang Li, Xiao-Ling Tang, Min Chen 
World J Clin Cases 9(31):9629-9634. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9629
Long Cong Nguyen, Khanh Truong Vu, Trang Thi Thuy Vo, Chau Ha Trinh, Tan Dang Do, Ngoc Thi Van Pham, Tuyen Van Pham, Thanh Tuan Nguyen, Hiep Canh Nguyen, Jeong-Sik Byeon 
World J Clin Cases 9(31):9670-9679. Published online Nov 6, 2021. doi: 10.12998/wjcc.v9.i31.9670