PROVEN: Patient Response with Vardenafil in Sildenafil Non-responders

Culley C. Carson III, MD Chapel Hill, North Carolina

Dimetris Hatzichristou, MD Thessaloniki, Greece

Serge Carrier, MD Montreal, Quebec

Doug Lording, MD Malvern, Australia

Jay Young, MD Laguna Hills, CA

Myron Murdoch, MD Greenbelt, MD

For the Vardenafil Study Group