1 Department of Urology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, 100730, China.
2 Graduate School of Peking Union Medical College, Beijing, 100730, China.
3 Department of Urology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, 100730, China. liumingbjhu@126.com.
4 Graduate School of Peking Union Medical College, Beijing, 100730, China. liumingbjhu@126.com.