Footnotes

• Contributors SM and AJ: Patient enrolment, study investigations, data recording and analysis, interpretation of data, drafting of manuscript. BCS and SS: Study conception and design, study supervision, critical revision for important intellectual content, final approval of the version to be published. BCS: Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of article are appropriately investigated and resolved.

• Competing interests None.

• Patient consent Obtained.

• Ethics approval Institutional Ethics Committee, Maulana Azad Medical College and associated Hospitals, New Delhi, India.

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