Received: 7 August 2020
Accepted: 11 March 2021
First Online: 19 April 2021
: Informed verbal consent was obtained from the parents of all neonates included in the study because most of the parents are illiterate. The study was approved by the ethics committee of Cairo University in agreement with the Helsinki Declaration of 2015.
: Not applicable
: The authors declare that they have no competing interests.