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Open-Access Journal
Opinion Review
Si Chen, Lin-Zhu Ren, Hong-Sheng Ouyang, Shen Liu, Li-Ying Zhang 
World J Clin Cases 9(1):1-7. Published online Jan 6, 2021. doi: 10.12998/wjcc.v9.i1.1
Review
Retrospective Cohort Study
Feng Wang, Shu-Geng Gao, Qi Xue, Feng-Wei Tan, Yu-Shun Gao, You-Sheng Mao, Da-Li Wang, Jun Zhao, Yin Li, Xiang-Yang Yu, Hong Cheng, Chen-Guang Zhao, Ju-Wei Mu 
World J Clin Cases 9(1):24-35. Published online Jan 6, 2021. doi: 10.12998/wjcc.v9.i1.24
Retrospective Study
Yan-Dong Chen, Shu-Xiang Chen, Hong-Guang Liu, Xiang-Sheng Zhao, Wen-Huan Ou, Huan-Xi Li, Hong-Xing Huang 
World J Clin Cases 9(1):81-90. Published online Jan 6, 2021. doi: 10.12998/wjcc.v9.i1.81
Observational Study
Systematic Reviews
Meta-Analysis
Case Report
Shunichi Matsumoto, Eijiro Yamada, Yasuyo Nakajima, Naoki Yamaguchi, Takashi Okamura, Toshiki Yajima, Satoshi Yoshino, Kazuhiko Horiguchi, Emi Ishida, Masashi Yoshikawa, Jun Nagaoka, Sho Sekiguchi, Mai Sue, Shuichi Okada, Izumi Fukuda, Ken Shirabe, Masanobu Yamada 
World J Clin Cases 9(1):163-169. Published online Jan 6, 2021. doi: 10.12998/wjcc.v9.i1.163
Vladimir Dugalic, Igor I Ignjatovic, Jelena Djokic Kovac, Nikola Ilic, Jelena Sopta, Slavenko R Ostojic, Dragan Vasin, Marko D Bogdanovic, Igor Dumic, Tamara Milovanovic 
World J Clin Cases 9(1):175-182. Published online Jan 6, 2021. doi: 10.12998/wjcc.v9.i1.175
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