- Correspondence to Dr Alvaro Alonso, Department of Epidemiology, Rollins School of Public Health, Emory University. 1518 Clifton Rd NE, CNR Room 3051, Atlanta, GA 30322, USA;
- Received September 9, 2016
- Revised November 7, 2016
- Accepted November 28, 2016
- First published January 5, 2017.
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