Jacqueline Tol*, Ilse C Swinkels, Peter M Spreeuwenberg, Chantal J Leemrijse, Dinny H de Bakker and Cindy Veenhof
* Corresponding author: Jacqueline Tol J.Tol@nivel.nl
BMC Health Services Research 2012, 12:317 doi:10.1186/1472-6963-12-317