Received: 8 March 2018
Accepted: 30 May 2018
First Online: 8 June 2018
Ethics approval and consent to participate
: Approval for the study was obtained from the National Ethics Committee for Health Research of the National Institute of Public Health, the Cambodian Ministry of Health. All respondents were orally informed of the study objectives and procedures before participation.
: Consent for publication was obtained from study participant during data collection.
: The authors declare that they have no competing interests.
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