Erectile Dysfunction

• San Diego Sexual Medicine — San Diego, California, United States
• Tulane Medical Center — New Orleans, Louisiana, United States
• Manhattan Medical Research — New York, United States

• GSK Investigational Site — Fairhope, Alabama, United States
• GSK Investigational Site — Homewood, Alabama, United States
• GSK Investigational Site — Huntsville, Alabama, United States
• GSK Investigational Site — Phoenix, Arizona, United States

• Hershey Med Center — Hershey, Pennsylvania, United States

• N.A. Lopatkin Urology and Interventional Radiology Research Center — Moscow, Russia
• Ryazan State Medical University named after academician I.P. Pavlov — Ryazan, Russia

• Boston University Medical Center — Boston, Massachusetts, United States

• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM to 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Beijing, China
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM to 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Changchun, China
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM to 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Changsha, China
• For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM to 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physician. — Chengdu, China

• Kuang Tien General Hospital — Taichung, Taiwan

• Ohio State University Medical Center — Columbus, Ohio, United States

• Catholic Univ. Seoul St. Mary's Hospital — Seoul, South Korea

Not specified