Funding for this research was provided by:
Health system research
Faculty of Medicine Siriraj Hospital, Mahidol University
Received: 10 July 2019
Accepted: 12 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Boards of all institutions, which waived the need for informed consent from participants.
: Not applicable. This study does not contain any individual personal data.
: The authors declare that they have no competing interests.