LETTERS.

Autor: Jenkins, Simon, Lefever, Robert, Boyce, Jonathan, Ralphs, David, Devlin, Brendan, Lloyd-Thomas, Adrian R., Howard, Richard, Lockie, Jane, Morton, N.S., McNicol, I.R., MacKenzie, I.Z., Bowell, P.J., Selinger, M., Hussey, Ruth M., Clarke, Cyril A., Limerick, Sylvia R., Gardner, Angela, Sweetman, B.J.

Publikováno v: BMJ: British Medical Journal (International Edition); 5/2/92, Vol. 304 Issue 6835, p1174, 9p, 1 Diagram, 2 Charts, 1 Graph