Affiliation: | a Department of General Practice, Radboud University Nijmegen Medical Centre, The Netherlandsb Department of General Practice, Research Institute Caphri, Maastricht University, The Netherlandsc Department of Medical, Clinical and Experimental Psychology, Research Institute Experimental PsychoPathology, Maastricht University, The Netherlandsd Department of Respiratory Medicine, Research Institute Caphri, University Hospital Maastricht, The Netherlands |