Funding for this research was provided by:
Thailand Research Fund (MRG5680092)
Office of the Higher Education Commission
Faculty of Medicine Siriraj Hospital, Mahidol University (Siriraj Graduate Scholarship)
Received: 10 April 2020
Accepted: 9 June 2020
First Online: 21 June 2020
Compliance with ethical standards
: The authors declare that they have no competing interests.
: The study was approved by Institutional Review Boards of Mahidol University and was conducted in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from all participants before being included in the study.