1. Salivary oestriol to progesterone ratio in relation to spontaneous labour. Issue 6450 (13th October 1984) Authors: Perry, L; Wathen, N; Chard, T Journal: BMJ Issue: Volume 289:Issue 6450(1984) Page Start: 1004 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗