1. School of Medicine, Stanford University, Palo Alto, California. (At time of data collection and analysis: Department of Bioengineering, University of Washington, Seattle, Washington.)
2. Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota.
3. Department of Biostatistics, University of Washington, Seattle, Washington.
4. Department of Electrical Engineering, University of Washington, Seattle, Washington.
5. Department of Urology, Seattle Children's Hospital, University of Washington Medical Center, University of Washington, Seattle, Washington.