- Correspondence to Jeroen Alexander de Wilde, Department of Youth Health Care, Municipal Health Service The Hague (GGD Den Haag), PO Box 12652, The Hague 2500 DP, The Netherlands;
- Received September 18, 2012
- Revised January 9, 2013
- Accepted January 10, 2013
- First published January 31, 2013.
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