Received: 9 February 2021
Accepted: 25 February 2022
First Online: 21 March 2022
: The study design and procedures were approved by the Institutional Review Board of the Christian Medical College and Hospital, Vellore, India (IRC number: 4544; dated 22 Oct 2000). The study was conducted in adherence to the Declaration of Helsinki. The informed consent form was obtained from the mothers of infants expressing their willingness to participate in the study.
: Not applicable
: The authors declare that they have no competing interests.