P. El Beitune, G. Duarte, S. M. Quintana, E. A. Figueiró-Filho, and H. Vannucchi, “Hypovitaminosis A: cofactor of deleterious clinic outcome in human being”, Medicina (Ribeirão Preto), vol. 36, no. 1, pp. 5–15, Mar. 2003, doi: 10.11606/issn.2176-7262.v36i1p5-15.