Department of Urology;
Institute of Urology;
National Urological Cancer Center;
Peking University First Hospital;
Peking University;
No.8;
Xishiku Street;
Xicheng District;
Beijing 100034;
P.R.China;
Birt-Hogg-Dubé syndrome; The folliculin(FLCN) gene; Mutation; Renal cell carcinoma;