Received: 30 July 2020
Accepted: 18 March 2021
First Online: 23 March 2021
: The study was approved by the Institutional Review Board (IRB) and the Human Research Ethics Committee (HREC) of the University of Nigeria, Nsukka (Reference number: NHREC/05/01/2008B-FWA00002458-IRB00002323). All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.