Abstract:1 We also prepared a series of internal reports for the foundation and the sites.
Preface vThis report is based on research funded by the Bill & Melinda Gates Foundation. The findings and conclusions we present are those of the authors and do not necessarily reflect positions or policies of the Bill & Melinda Gates Foundation. For more information, please visit www.gatesfoundation.org.More information about RAND can be found at www.rand.org. Questions about this report should be directed to
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