Sandra Beijer1
, Erik van Rossum1
, Pierre S Hupperets2
, Cor Spreeuwenberg3
, Marieke van den Beuken4
, Ron A Winkens5
, Lisette Ars6
, Ben E van den Borne7
, Alexander de Graeff8
and Pieter C Dagnelie1 
1Department of Epidemiology, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands
2Department of Internal Medicine/Oncology, University Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands
3Department of Health Care Studies, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands
4Pain Management and Research Centre, University Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands
5Department of Integrated Care, University Hospital Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands
6Community Care Organisation, GroenekruisDomicura Maastricht and area, Mockstraat 1, 6226 CA Maastricht, The Netherlands
7Department of Pulmonology, Catharina Hospital Eindhoven, P.O. Box 1350, 5602 ZA Eindhoven, The Netherlands
8Department of Internal Medicine/Medical Oncology, University Medical Center Utrecht, P.O. Box 85500, 3508 GA Utrecht, The Netherlands