Wah Yang1, Jingge Yang1, Cunchuan Wang2. 1. Department of General Surgery, First Affiliated Hospital of Jinan University, 613 Huangpu Avenue West, Guangzhou, 510630, Guangdong Province, China. 2. Department of General Surgery, First Affiliated Hospital of Jinan University, 613 Huangpu Avenue West, Guangzhou, 510630, Guangdong Province, China. twcc@jnu.edu.cn.