Development and External Validation of a Novel Nomogram to Predict the Probability of Pelvic Lymph-node Metastases in Prostate Cancer Patients Using Magnetic Resonance Imaging and Molecular Imaging with Prostate-specific Membrane Antigen Positron Emission Tomography

André N. Vis, Dennie Meijer^*, Matthew J. Roberts, Amila R. Siriwardana, Andrew Morton, John W. Yaxley, Hemamali Samaratunga, Louise Emmett, Peter M. van de Ven, Martijn W. Heymans, Jakko A. Nieuwenhuijzen, Henk G. van der Poel, Maarten L. Donswijk, Thierry N. Boellaard, Ivo G. Schoots, Phillip Stricker, Anne Maree Haynes, Daniela E. Oprea-Lager, Geoffrey D. Coughlin, Pim J. van Leeuwen