- Correspondence to Joana Kist-van Holthe, Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Centre, van der Boechorststraat 7, Amsterdam 1081 BT, The Netherlands;
- Received February 15, 2012
- Accepted June 10, 2012
- First published July 23, 2012.
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