Footnotes

• Presented at This research work was partly presented at Anesthesiology 2018, Abstract No: 4176, as a poster discussion at the American Society of Anesthesiologists Annual Meeting, 13–17 October 2018, Moscone Convention and Exhibition Centre, San Francisco, California, USA.

• Contributors BS was involved with design of the study, review of the literature, data review, data analysis and preparation of the manuscript. JP was involved with review of the literature, data review, data analysis, and editing the manuscript. PP was involved with data review, review of the literature, and editing the manuscript. PV was involved with review of the literature, data review, and editing the manuscript. MKK was involved with conception, planning and design of the report, review of the data, and preparation of the manuscript.

• Funding This work was locally funded by the Department of Anesthesiology, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Author note IRB Contact Information: Institutional Review Board of Chulalongkorn University, Bangkok, Thailand on 30 November 2017 (Ref: 583/60), Tel No: +66 22564493. Clinical Trial Number and Registry URL: Thai Clinical Trials Registry, http://www.clinicaltrials.in.th, Trial ID No: TCTR20180211002; Date of Registration: 11 February 2018, Date of volunteer enrollment: 15 February–30 April 2018.