1. Department of Epidemiology and Biostatistics, School of Public Health, Texas A&M University, College Station, Texas, USA.
2. Department of Statistics, Texas A&M University, College Station, Texas, USA.
3. Department of Statistics, University of California, Riverside, California, USA.
4. Research Department, Gulf Medical University, Ajman, United Arab Emirates.
5. Private Urology Practice, Bremerhaven, Germany.