1 Division of Physical Medicine and Rehabilitation, Department of Orthopedic Surgery, Stanford University School of Medicine, Redwood City, California, USA.
2 Department of Physical Medicine and Rehabilitation, Santa Clara Valley Medical Center, San Jose, California, USA.
3 Division of Urology, Santa Clara Valley Medical Center, San Jose, California, USA.
4 Department of Urology, Stanford University Medical Center, Stanford, California, USA.