LETTERS.

Autor: Levy, Terry, Stephens, Nigel, Davis, R.C., Jolore, O.M.P., Byrne, J., Haq, S.M.U., Jowett, N.I., Tsung O Cheng, Rawles, John, Adams, Jacqueline, Trent, Roger, Cresswell, P.A., Stephen, A.A., Smith, Lindsay F.P., Gold, Ann E., MacLeod, Kenneth M., Prier, Brian M., Klocker, Norbert

Publikováno v: BMJ: British Medical Journal (International Edition); 9/25/93, Vol. 307 Issue 6907, p798, 8p, 2 Charts, 1 Graph