- Correspondence to Dr Patricia Kissinger, Department of Epidemiology, Tulane University School of Public Health and Tropic Medicine, SL-18, 1440 Canal Street, New Orleans, LA 70012, USA;
- Received December 30, 2012
- Revised March 22, 2013
- Accepted March 24, 2013
- First published April 20, 2013.
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