1. Medical School of Guizhou University, Jiaxiu South road, Guiyang, Guizhou Province, P.R. China
2. Department of Urology Surgery, Guizhou Province People’s Hospital, No. 83 East Zhongshan Road, Guiyang, Guizhou Province, P.R. China
3. Department of Oral and Maxillofacial Surgery, Guizhou Provincial People’s Hospital, No. 83 East Zhongshan Road, Guiyang, Guizhou Province, P.R. China
4. Guangzhou Medical University, New town, Panyu district, Guangzhou Province, P.R. China