Received: 23 July 2019
Accepted: 24 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: This study was approved by Health Research Ethical Committee (HREC) of the University of Calabar Teaching Hospital. Informed consent (written) was obtained from the study participants before commencing the study.
: Not applicable.
: The authors declare that they have no competing interests.