- Correspondence to Dr Hiram Beltrán-Sánchez, Department of Community Health Sciences, Fielding School of Public Health and California Center for Population Research, University of California, Los Angeles, 650 Charles E. Young Drive South, Room 41-257 CHS, Los Angeles, CA 90095-1772, USA;
- Received September 28, 2015
- Revised April 4, 2016
- Accepted April 7, 2016
- First published April 21, 2016.
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