1
in: The British Medical Journal | Vol. 281 (1980)
2
in: The British Medical Journal | Vol. 281 (1980), p. 3-37
3
in: The British Medical Journal | Vol. 281 (1980)
4
in: The British Medical Journal | Vol. 280 (1980), p. 3-36
5
in: The British Medical Journal | Vol. 280 (1980)
6
in: The British Medical Journal | Vol. 281, No. 6235 (1980), p. 336
7
in: The British Medical Journal | Vol. 281, No. 6235 (1980)
10
in: The British Medical Journal | Vol. 281, No. 6235 (1980), p. 300