Prevalence and factors associated with underutilization of antenatal care services in Nigeria: A comparative study of rural and urban residences based on the 2013 Nigeria demographic and health survey. - Adewuyi EO; Auta A; Khanal V; Bamidele OD; Akuoko CP; Adefemi K; Tapshak SJ; Zhao Y (PloS one, 2018)