1. Department of Urology, First Affiliated Hospital of Guangzhou Medical University, and Guangdong Key Laboratory of Urology, Guangzhou, China.
2. Department of Surgery, Oncological, and Stomatological Sciences, Section of Urology, University of Palermo, Palermo, Italy.
3. Department of Biostatistics and Epidemiology, College of Public Health, East Tennessee State University, Johnson City, Tennessee.