1. Department of Vasculocardiology, The Affiliated Hospital of Hebei University, Baoding, Hebei, China
2. Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
3. Department of Orthopaedics, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
4. Department of Orthopaedics, The Affiliated Hospital of Hebei University, Baoding, Hebei, China
5. Department of Neurosurgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China