1. Department of Thoracic Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China (mainland)
2. Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China (mainland)
3. Department of Neurosurgery, Liaohe Oil Gem Flower Hospital, Panjin, Liaoning, China (mainland)