- Correspondence to Dr Tanja A J Houweling, Department of Public Health, Erasmus MC, University Medical Center Rotterdam, P.O. Box 2040, Rotterdam 3000 CA, The Netherlands;
- Received March 10, 2016
- Revised August 17, 2016
- Accepted August 26, 2016
- First published September 26, 2016.
Abstract in Spanish
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- Abstract in Spanish - Online abstract
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