Affiliation: | 1. Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China;2. Department of Orthopedics and Traumatology, Xi'an Hospital of Traditional Chinese Medicine, Xi'an, China;3. Department of Traditional Chinese Medicine Orthopedics Diagnosis and Treatment Center, Xi'an Honghui Hospital, Xi'an, China;4. Department of Public Health, Shaanxi University of Chinese Medicine, Xi'an, China |