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Collaborators Not Applicable.
Contributors RKS was involved with review of the literature, data review, data analysis, and preparation of the manuscript. 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. MAR was involved with review of microanatomic data and editing the manuscript. XS-B was involved with review of microanatomic data and editing the manuscript.
Funding This work was locally funded by the Department of Anesthesia and Intensive Care, Faculty of Medicine, The Chinese University of Hong Kong, 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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