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Contributors SS conceived of the idea and collected the data. SS and BS conducted the procedure. KP helped to design the study and analysed the data. SS and KP drafted the manuscript. All authors read and approved the final manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Obtained.
Ethics approval This study was approved by the Bumrungrad International – Institutional Review Board (BI-IRB 208-12-15 Dq).
Provenance and peer review Not commissioned; internally peer reviewed.
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