1. Nursing Faculty, School of Medicine, Jinhua Polytechnic, Jinhua, Zhejiang 321007, P.R. China
2. Department of Orthopedics, Jinhua Hospital of Traditional Chinese Medicine, Jinhua, Zhejiang 321000, P.R. China
3. Department of Obstetrics and Gynecology, Jinhua People's Hospital, Jinhua, Zhejiang 321000, P.R. China
4. Jinhua Center of Laboratory Animals, Jinhua Food and Drug Inspection and Testing Institute, Jinhua, Zhejiang 321000, P.R. China