1. St Paul Heart Clinic, 225 North Smith Avenue, Suite 400, St Paul, MN 55102, USA. Tel: +1 651 726 6767; Fax: +1 651 379 4457; University of Minnesota, Minneapolis, MN, USA
2. St Paul Heart Clinic, St Paul, MN, USA; University of Minnesota, Minneapolis, MN, USA
3. St Paul Heart Clinic, St Paul, MN, USA
4. Metro Urology, St Paul, MN, USA
5. The Minnesota Men's Health Center, Woodbury, MN, USA
6. University of Minnesota, Minneapolis, MN, USA; The EpiCenter for Sexual Health and Medicine, Edina, MN, USA