1. Department of Anesthesiology, Guangdong Provincial Key Laboratory of Major Obstetric Diseases; Guangdong Provincial Clinical Research Center for Obstetrics and Gynecology, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China (mainland)
2. Department of Anesthesiology, Longgang District Central Hospital of Shenzhen, Shenzhen, Guangdong, China (mainland)