Velasquez-Melendez, G.; Roncada, M. J.; Toporovski, J.; Okani, E. T.; Wilson, D. Relationship Between Acute Diarrhoea and Low Plasma Levels of Vitamin A and Retinol Binding Protein . Rev. Inst. Med. Trop. São Paulo 1996, 38 (5), 365-370.