Camiel De Bruijn1,2
, Rob de Bie1,3
, Jacques Geraets1,3
, Marielle Goossens1,4
, Albère Köke5,7
, Wim van den Heuvel1
, Geert van der Heijden6
and Geert-Jan Dinant2 
1
Institute for Rehabilitation Research, Hoensbroek, The Netherlands
2
Department of General Practice and Care and Public Health Research Institute, Maastricht University, The Netherlands
3
Department of Epidemiology, Maastricht University, The Netherlands
4
Department of Medical, Clinical and Experimental Psychology, Maastricht University, The Netherlands
5
Hoensbroek Rehabilitation Centre, Hoensbroek, The Netherlands
6
Julius Center for Health Sciences and Primary Care, University Medical Centre, Utrecht, The Netherlands
7
Pain Management and Research Centre, University Hospital Maastricht, The Netherlands