1. Clinical Effectiveness Research Group University of Oslo and Oslo University Hospital Norway
2. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
3. Surgical Care Science Department of Molecular Medicine and Surgery Karolinska Institutet Karolinska University Hospital Stockholm Sweden
4. Department of Surgery and Cancer Imperial College London UK
5. Division of Physical Activity, Prevention and Cancer National Center for Tumor Diseases (NCT) and German Cancer Research Center (DKFZ) Heidelberg Germany