- Correspondence to Dr Ramona Hambach, Department of Epidemiology and Social Medicine, Campus Drie Eiken, Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, Antwerp BE-2610, Belgium;
- Received May 1, 2012
- Revised September 14, 2012
- Accepted September 25, 2012
- First published October 26, 2012.
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