Footnotes

• Twitter @Sivakumar_SRK

• Contributors MKK was involved with conception, planning and design of the report, review of the data, and editing the manuscript, and is the guarantor for this study. JP was involved with planning and design of report, review of the literature and preparation of the manuscript. RKS was involved with review of the literature, data review, data analysis, and preparation of the manuscript. WS was involved with review of data, data analysis and editing the manuscript.

• Funding This work was locally funded by the Department of Anesthesia and Intensive Care, The Chinese University of Hong Kong, Faculty of Medicine, Prince of Wales Hospital, Shatin, New Territories, Hong Kong, SAR, China.

• Competing interests None declared.

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

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