1. Department of Orthopaedics, Gansu Provincial Hospital of Traditional Chinese Medicine, Lanzhou, Gansu, China
2. The Second Clinical Medical College, Lanzhou University, Lanzhou, Gansu, China
3. Department of Spine Surgery, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, China
4. The First Clinical Medical College, Lanzhou University, Lanzhou, Gansu, China
5. Department of Gastroenterology, Gansu Provincial People’s Hospital, Lanzhou, Gansu, China