1. Department of Urology, The First College of Clinical Medical Science, China Three Gorges University, Yichang Central People's Hospital, Yichang, Hubei 443003, P.R. China
2. Department of Urology, Yidu People's Hospital, Yichang, Hubei 443300, P.R. China
3. Intensive Care Unit, The First College of Clinical Medial Science, China Three Gorges University, Yichang Central People's Hospital, Yichang, Hubei 443003, P.R. China