HMOX1 gene promoter alleles and high HO-1 levels are associated with severe malaria in Gambian children. by Walther, M, De Caul, A, Aka, P, Njie, M, Amambua-Ngwa, A, Walther, B, Predazzi, I, Cunnington, A, Deininger, S, Takem, E, Ebonyi, A, Weis, S, Walton, R, Rowland-Jones, S, Sirugo, G, Williams, S, Conway, D