Access to emergency hospital care provided by the public sector in sub-Saharan Africa in 2015: a geocoded inventory and spatial analysis oleh Paul O Ouma, MSc, Joseph Maina, BSc, Pamela N Thuranira, BSc, Peter M Macharia, MSc, Victor A Alegana, PhD, Mike English, ProfFMedSci, Emelda A Okiro, PhD, Robert W Snow, ProfFMedSci