No one. You can't repair the nerves if they've been damaged but some reports show return of function up to 18 months after surgery if the nerves were spared. In the meantime, 1st try the meds; viagra, cialis, levitra (vardenafil). 2nd level would be vacuum pump, muse or injections. 3rd level would be a prosthesis. There is help. See your urologist. For more: www.Peedoc.Com @thepeedoc.