Published on in Vol 5, No 11 (2017): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/7827, first published
.
1 Department of Preventive and Social Medicine, College of Health Sciences, University of Port Harcourt, Port Harcourt, Nigeria
2 World Health Organization, Port Harcourt, Nigeria
*these authors contributed equally