- Correspondence to Marianne K Dees, General Practitioner, Radboud University Nijmegen Medical Centre, Department of Primary and Community Care, Internal postal code 117, PO Box 9101, 6500 HB Nijmegen, The Netherlands;
- Received 17 May 2011
- Accepted 4 July 2011
- Published online 21 November 2011.
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