- Correspondence to Professor Trudy van der Weijden, Department of General Practice, CAPHRI School of Public Health and Primary Care, Maastricht University, PO Box 616, Maastricht 6200 MD, The Netherlands;
- Received September 9, 2012
- Revised May 8, 2013
- Accepted May 14, 2013
- First published June 7, 2013.
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