1. Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Guangdong Pharmaceutical University , No. 280, Outer Ring East Road, Guangzhou University City, Panyu District, Guangzhou City, Guangzhou 510006 , PR China
2. Lianjiang People’s Hospital , No. 30 Renmin Avenue Middle, Lianjiang City, Zhanjiang City, Guangdong Province, Lianjiang 524400 , PR China