University of Maryland Medical Center, Baltimore, Maryland, United States
University of Texas Southwestern, Dallas, Texas, United States
University of California, Los Angeles, Los Angeles, California, United States
Sun Research Institute, San Antonio, Texas, United States
Sensible Healthcare, LLC, Ocoee, Florida, United States
Clinical Trials Research, Roseville, California, United States
R&H Clinical Research, Katy, Texas, United States
TriWest Research Associates, LLC, El Cajon, California, United States
United Medical Doctors, Murrieta, California, United States
Neostart Corporation dba AGA Clinical Trials, Hialeah, Florida, United States
Jacksonville Impotence Treatment Center, Jacksonville, Florida, United States
Aventiv Research, Inc., Columbus, Ohio, United States