TY  - SER
TI  - British Medical Journal : Vol. 302 [6767 - 6779] January - March
SN  - 09598138
U1  - 616 
PY  - 1991///
CY  - London
PB  - BMJ
KW  - MEDICAL SCIENCES
KW  - Medicine
UR  - https://www.bmj.com/archive/print/1991
ER  -