Geographical access to care at birth in Ghana: a barrier to safe motherhood. - Gething, Peter W.; Amoako Johnson, Fiifi; Frempong-Ainguah, Faustina; Nyarko, Philomena; Baschieri, Angela; Aboagye, Patrick; Falkingham, Jane; Matthews, Zoe; Atkinson, Peter M. (BMC Public Health, 2012)