Longitudinal statistical analysis during five years follow-up within a randomized surgical trial for portal hypertension in schistosomiasis - Strauss, E; Forster, S; Gayotto, Luiz Carlos da Costa; Silva, L. C.; Macedo, A L; Fukushima, J T; Silva, A T; Saad, W A; Raia, A; Raia, Silvano (Biennial Scientific Meeting of the International Association for the Study of the Liver, 1990)