- Correspondence to Dr Christopher R Sudfeld, Department of Epidemiology, Harvard School of Public Health, 667 Huntington Ave, Building 1, Room 1102, Boston, MA 02115, USA; and Dr Barbara S Mensch, Population Council, One Dag Hammarskjold Plaza, 9th Floor, New York, NY 10017, USA;
- Received October 8, 2012
- Revised April 24, 2013
- Accepted May 21, 2013
- First published June 21, 2013.
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