1. Department of Gastrointestinal Surgery Center, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, China (mainland)
2. Department of Operating Room, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China (mainland)
3. Department of Gynecology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China (mainland)