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Article History

Received: 12 May 2017

Accepted: 9 January 2018

First Online: 17 January 2018

Ethics approval and consent to participate

: The study was granted ethical approval from the Institute’s Ethical Committee, PGIMER, Chandigarh (PGI/IEC/2012/810–1 P-154). The anonymity and confidentiality of participants in the studies were ensured. Since the study is a systematic review of studies and individual level data is not obtained, the consent was not required.

: Since individual level data is not presented, the consent for publication of data was not required.

: The authors declare that they have no competing interests.

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