- Correspondence to Dr M I Geerlings, University Medical Center Utrecht, Julius Center for Health Sciences and Primary Care, Stratenum 6.131, PO Box 85500, 3508 GA Utrecht, The Netherlands;
- Received October 15, 2010
- Revised February 10, 2011
- Accepted March 8, 2011
- First published April 1, 2011.
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