Received: 18 September 2018
Accepted: 5 December 2019
First Online: 3 February 2020
Ethics approval and consent to participate
: The authors declare that the animal study protocol was approved by the appropriate conferred with that responsibility - Faculty Research Ethical Committee, Faculty of Basic Medical Sciences (Approval Number: 014B20117). The research was performed in accordance with ethical guidelines of FAREC-FBMS, University of Calabar, Nigeria. As laboratory animals were used in this study, consent to participate was not required.
: Not applicable.
: The authors declare no conflict of interest.