[1] Radboud Univ Nijmegen, Nijmegen Med Ctr, Ctr Qual Care Res 117, NL-6500 HB Nijmegen, Netherlands
[2] Radboud Univ Nijmegen, Nijmegen Med Ctr, Pain Ctr, NL-6500 HB Nijmegen, Netherlands
[3] Radboud Univ Nijmegen, Nijmegen Med Ctr, Ctr Qual Care Res & Vocat Training Gen Practition, NL-6500 HB Nijmegen, Netherlands