by Ryder, RW, Nsa, W, Hassig, SE, Behets, F, Rayfield, M, Ekungola, B, Meldon, AM, Mulenda, U, Francis, H, Mwandagalirwa, K, Davachi, F, Rogers, M, Nzilambi, N, Greenberg, A, Mann, J, Quinn, TC, Piot, P, Curran, JW
Published in International journal of gynecology and obstetrics (1990)