Norman Chisholm
Extract
The 28-week rule is a medical and scientific, as well as legal, concept that allows the practising doctor to work to about 20 weeks’ gestation with comfortable leeway. To make a 20-week limit would be to reduce the effective maximum for abortion to 16 weeks.
Chisholm N. (Correspondence) Abortion (Amendment) Bill. Br Med J. 1979 Jul 28;2(6184):276.