K Schrøder1,2, R F Lamont2,3, J S Jørgensen2, N C Hvidt1,4. 1. Research Unit of General Practice, Department of Public Health, University of Southern Denmark, Odense, Denmark. 2. Research Unit of Gynecology and Obstetrics, Odense University Hospital, Institute of Clinical Research, University of Southern Denmark, Odense, Denmark. 3. Division of Surgery, Northwick Park Institute for Medical Research Campus, University College London, London, UK. 4. Academy of Geriatric Cancer Research, Odense University Hospital, Institute of Clinical Research, University of Southern Denmark, Odense, Denmark.