- Correspondence to Dr Vanessa R Schick, The University of Texas Health Science Center at Houston, School of Public Health, 1200 Pressler Street, Rm E-917, Houston, TX 77030, USA;
- Received September 5, 2014
- Revised January 6, 2015
- Accepted January 7, 2015
- First published January 30, 2015.
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