1. Department of Urology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, P.R. China.
2. Clinical Laboratory, Dongying People's Hospital, Dongying, P.R. China.
3. Department of Urology, Affiliated Yantai Hospital of Binzhou Medical University, Yantai, P.R. China.
4. Department of Urology, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, P.R. China.
5. Department of Medicine, Division of Regenerative Medicine, University of California, San Diego, School of Medicine, La Jolla, California, USA.
6. Department of Neurology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, P.R. China.