TY  - SER
TI  - British Medical Journal : Vol. 301 [6742 - 6753] July - September
SN  - 09598138
U1  - 616 
PY  - 1990///
CY  - London
PB  - BMJ
KW  - MEDICAL SCIENCES
KW  - Medicine
UR  - https://www.bmj.com/archive/print/1990
ER  -