Funding for this research was provided by:
National Science and Technology Management Information System (DST/INSPIRE Fellowship/2011)
Received: 9 December 2019
Accepted: 3 September 2020
First Online: 16 September 2020
Ethics approval and consent to participate
: The study was ethically approved by the ethical committee of the Institute of Medical Sciences, Banaras Hindu University, Varanasi, India. Consent to participate is not applicable.
: Not applicable.
: All the authors declare that they have no competing interests in this study.