CORRESPONDENCE.

Autor: Kornegay, Horace R., Mantel, Nathan, Harris, Jeffrey E., DuMouchel, William H., Macdonald, Eleanor, Hirayama, T., Davies, J.R., Zachary, R.B., King, John D., Blumenthal, I., Conner, A.N., Walker, J.F., Cronin, C.J., McDonald, Peter, Dickinson, C.J., Banks, A.W., Gibb, Donald M.F., Whale, F.E.

Publikováno v: British Medical Journal (Clinical Research Edition); 10/3/1981, Vol. 283 Issue 6296, p914-921, 8p, 4 Charts, 1 Graph