Received: 12 June 2020
Accepted: 23 October 2020
First Online: 10 November 2020
Ethics approval and consent to participate
: The study was approved by institutional ethics committee of Narayana Nethralaya (EC Ref No. 2020/02/01) and written informed consent was obtained from the subjects or parents/legal guardians (in case when the subjects were < 18 years of age) at the time of registration at the hospital.
: Not applicable.
: The authors declare that they have no competing interests.