1. aDepartment of Epidemiology and Medical Informatics, Korea University, Seoul, Korea
2. bDepartment of Urology, Soonchunhyang University College of Medicine, Seoul, Korea
3. cDepartment of Urology, Korea University College of Medicine, Seoul, Korea
4. dDepartment of Preventive Medicine, Korea University College of Medicine, Seoul, Korea
5. eDepartment of Executive MBA, Korea University Business School, Seoul, Korea
6. fDepartment of Social Welfare, Kyungpook National University College of Social Science, Daegu, Korea
7. gDepartment of Urology, Gil Hospital, Gacheon University College of Medicine, Korea