1. Department of Orthopedics, QingPu Branch of Zhongshan Hospital Affiliated to Fudan University, Qingpu District Central Hospital of Shanghai, Shanghai 201700, P.R. China
2. Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai 201600, P.R. China
3. Department of Laboratory, Taishan Coal Sanatorium, Taian, Shangdong 201700, P.R. China