Guest Editors: Tobias S. Köhler 9Department of Urology, Mayo Clinic, Rochester, MN, USA); Francisco E. Martins (Department of Urology, University of Lisbon, School of Medicine, Hospital Santa Maria, Lisbon, Portugal)

Guest Editor: Tilman Todenhöfer (Clinical Trial Unit Studienpraxis Urologie, Nürtingen, Germany)

Guest Editors: Badrinath Konety (Department of Urology, University of Minnesota, Minneapolis, MN, USA); Daniel W. Lin (Department of Urology, University of Washington, Seattle, Washington, USA)