LETTERS. - Johnson, Richard C.; Fligelstone, Louis J.; Maughan, Timothy S.; Kale, V.R.; Notaras, M.J.; Milroy, S.J.; Quinn, A.C.; Fawcett, W.J.; Douglas, J.D.M.; Connolly, M.J.; Haddad, Peter M.; O'Neill, William M.; et al. (BMJ: British Medical Journal (International Edition), 1994)