Received: 15 June 2018
Accepted: 19 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: This study was conducted in a tertiary referral center. The study protocol was approved by the University Institutional Review Board (IRB), Faculty of Medicine, Chulalongkorn University IRB No. 394/60 or COA No. 827/2017. The IRB was approved by Emeritus Professor Tada Sueblinvong, MD and Assistant Professor Prapapan Rajatapiti, MD, PhD on September 26, 2017.Not applicable. This is a retrospective study.
: Not applicable.
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