Text and Data Mining valid from 2020-01-11
Received: 2 July 2019
Accepted: 17 December 2019
First Online: 11 January 2020
Compliance with ethical standards
: The protocol for this study was approved by the Siriraj Institutional Review Board (SIRB) (COA no. Si542/2017).
: All authors declare no personal or professional conflicts of interest relating to any aspect of this study.