- Correspondence to Amaya G Perez-Brumer, Department of Sociomedical Sciences, Columbia Mailman School of Public Health, 722 West 168th St, New York, NY 10032, USA,
- Received July 31, 2015
- Revised December 16, 2015
- Accepted January 23, 2016
- First published February 24, 2016.
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