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Author to whom correspondence should be addressed; E-Mail:predmon@gsu.edu; Tel.: +1-404-205-1615; Fax: +1-404-413-1140.
Contributions: Pamela Redmon provided strategic direction and was the lead author;
Jeffrey Koplan, Michael Eriksen and Wang Kean provided strategic direction and contributed to the development of the manuscript;
Shuyang Li contributed to data analysis and development of the manuscript.
The findings and conclusions contained within are those of the authors and do not necessarily reflect positions or policies of the Bill & Melinda Gates Foundation.
The authors declare no conflict of interest.
This publication is based on research funded by (or in part by) the Bill & Melinda Gates Foundation.
© 2014 by the authors; licensee MDPI, Basel, Switzerland.