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Article History

Received: 12 January 2018

Accepted: 6 July 2018

First Online: 30 August 2018

Ethics approval and consent to participate

: This study was conducted after getting the approval from the ethical committee of Government Medical College Kozhikode. All patients who participated in the study were included after getting informed consent from their parents.

: We have obtained consent for the study and publication of data from the parents.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.