1. Department of Orthopedics, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
2. Department of General Surgery, Tongliao City Hospital, Tongliao, Inner Mongolia 028000, P.R. China
3. Department of Disinfecting Supply Division, Tongliao City Hospital, Tongliao, Inner Mongolia 028000, P.R. China