Epidemiology and clinical practice. Issue 6222 (26th April 1980) - Acheson, E D; Barker, D J P; Blacklock, N J; Cole, R B; Elmes, P C; Galbraith, N S; Heller, R F; McKee, W; Moore, R G; Oliver, M F; Rose, G A; Shepherd, M; et al.