Department of Urology and Andrology;
Shanghai Institute of Andrology;
Renji Hospital;
Shanghai Jiao Tong University School of Medicine;
Shanghai 200001;
China;
Department of Urology;
Yantai Affiliated Hospital of Binzhou Medical University;
Yantai 264100;
China;
erectile dysfunction; nerve-sparing radical prostatectomy; penile length; tadalafil; vacuum erectile devices;