Wagenaar BH, Gimbel S, Hoek R, Pfeiffer J, Michel C, Manuel JL, Cuembelo F, Quembo T, Afonso P, Gloyd S, Sherr K. Stock-outs of essential health products in Mozambique – longitudinal analyses from 2011 to 2013. Trop Med Int Health. 2014 Jul;19(7):791-801.