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Contributors MK: data collection, follow-up, data interpretation, literature search, construction of figures and writing the manuscript. JK: involved in study supervision, data interpretation and writing the manuscript. UKM: involved in data interpretation and writing the 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 for publication Not required.
Ethics approval This study was approved by Institutional Ethics Committee (PGI/BE/818/2015, IEC code: 2015-131-IP-88), SGPGIMS, Lucknow, India.
Provenance and peer review Not commissioned; internally peer reviewed.
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