1. Department of Orthopedics, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China (mainland)
2. Department of Anesthesiology, The Qingdao Women and Children’s Hospital, Qingdao, Shandong, China (mainland)
3. Supply Department, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China (mainland)