Funding for this research was provided by:
Health Systems Research Institute, Thailand
Faculty of Medicine Siriraj Hospital, Mahidol University
Text and Data Mining valid from 2018-07-17
Received: 6 June 2018
Accepted: 4 July 2018
First Online: 17 July 2018
Ethics approval and consent to participate
: The study protocol was approved by the Siriraj Institutional Review Board, and written informed consent was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests
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