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Presented at This research work was partly presented at Anesthesiology 2017, Abstract no: A1066, as a poster discussion at the American Society of Anesthesiologists Annual Meeting, Boston Convention and Exhibition Center, 21–25 October 2017, Boston, Massachusetts, USA.
Contributors All figures and tables included in the manuscript are original and belong to the authors.
Funding This study was supported by a grant from the Siriraj Research Development Fund, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval This study was approved by the Siriraj Institutional Review Board (SIRB) of the Mahidol University, Bangkok, Thailand.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement The data from this clinical study will be available for sharing provided all conditions stipulated by the local university are met.
Author note All figures and tables included in the manuscript are original and belong to the authors.