Erratum
After publication of this research article [1], we noticed a mistake in the names of two of the authors. Olusegun V Osho name should be Olusegun V Oshomoji, and Nneka M Chukumah name should be Nneka M. Chukwumah. This has been now corrected. We apologise for any inconvenience.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.