1 Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands; Scientific Bureau, Dutch Institute for Clinical Auditing, Leiden, The Netherlands. Electronic address: f.hoeijmakers@lumc.nl.
2 Department of Surgery, Northwest Clinics, Alkmaar, The Netherlands.
3 Department of Radiology and Nuclear Medicine, Amsterdam UMC, VU University Medical Center, Amsterdam, The Netherlands; Department of Radiology and Nuclear Medicine, Haaglanden Medical Center, The Hague, The Netherlands.
4 Department of Radiation Oncology, The Netherlands Cancer Institute-Antoni van Leeuwenhoek, Amsterdam, The Netherlands.
5 Department of Pulmonary Diseases, Leiden University Medical Center, Leiden, The Netherlands.
6 Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands; Scientific Bureau, Dutch Institute for Clinical Auditing, Leiden, The Netherlands.
7 Department of Surgery and Department of Cardiothoracic Surgery, Amsterdam UMC location Vrije Universiteit, Amsterdam, The Netherlands.