Guidance for the gastrointestinal evaluation and management of iron deficiency in Sub-Saharan Africa oleh W M Simmonds, Y Awuku, C Barrett, M Brand, K Davidson, D Epstein, E Fredericks, S Gabriel, S Grobler, C Gounden, L Katsidzira, V J Louw, V Naidoo, C Noel, E Ogutu, N Ramonate, N Seabi, M Setshedi, J Van Zyl, G Watermeyer, C Kassianides