- Correspondence to Daniel Kotz, Department of General Practice, School for Public Health and Care (CAPHRI), Maastricht University Medical Centre, PO Box 616, 6200 MD Maastricht, Maastricht, The Netherlands;
- Received January 12, 2009
- Revised April 1, 2009
- Accepted April 20, 2009
- First published August 28, 2009.
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