1. Department of Urology, Peking University Third Hospital, 49 North Garden Road, Beijing 100191, China
2. School of Statistics, University of Minnesota, Minneapolis, MN 55455, USA
3. Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China