LETTERS.

Autor: Symonds, Gabriel, Speed, C.A., Brox, Jens Ivar, Staff, Peer, Ljunggren, Anne Elisabeth, Brevik, John Ivar, Bonten, M.J.M., Gaillard, C.A., der Geest, Svan, Winter, R.J., Willatts, S.M., Guillebaud, John, Lockley, D., Styles, C., Daly, Helena M., Griffin, J.P., Davis, R.C., Watt, Andrew H.

Publikováno v: BMJ: British Medical Journal (International Edition); 12/11/93, Vol. 307 Issue 6918, p1559, 8p, 4 Charts, 1 Graph