Funding for this research was provided by:
Centers for Disease Control and Prevention
Received: 22 August 2018
Accepted: 7 May 2019
First Online: 15 May 2019
Ethics approval and consent to participate
: The Thailand MOPH ethical review committee (ERC) reviewed and approved the study protocol. The U.S. Centers for Disease Control and Prevention (CDC)'s Human Research Protection Office approved the study based on reliance on Thailand ERC’s approval. The consent obtained from study participants was written.
: Not applicable.
: The authors declare that they have no competing interests.
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