1. Department of Gynecology, Linyi Tumor Hospital, Linyi, P.R. China.
2. Department of Orthopedics, Linyi Traditional Chinese Medicine Hospital, Linyi, P.R. China.
3. Department of Orthopedics, Linyi People's Hospital, Linyi, P.R. China.
4. Department of General Surgery, Tumor Hospital of Shandong Province, Jinan, P.R. China.