Article History
Received: 28 November 2018
Accepted: 15 April 2019
First Online: 3 May 2019
Compliance with ethical standards
:
: The author declares that they have no conflicts of interest.
: All procedures (screening/examination were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Institutional ethical approval was obtained vide letter no NK/4061/STUDY/331.
: Informed consent was obtained from parents/guardians of all the children screened/examined for the present study. Along with this due permission was also obtained from the principals of concerned schools.