Valesca P Retèl1, Sabine C Linn2, Wim H van Harten3. 1. Netherlands Cancer Institute, Amsterdam, the Netherlands. 2. Netherlands Cancer Institute, Amsterdam; and University Medical Center Utrecht, Utrecht, the Netherlands. 3. Netherlands Cancer Institute, Amsterdam; and University of Twente, School of Governance and Management, Enschede, the Netherlands w.v.harten@nki.nl.