When and where did the study take place?

The UKFSST study recruited people from 506 participating GP practices based in 14 UK centres: 11 in England, two in Wales, and one in Scotland. The centres were located in Glasgow, Swansea, Newport/Cardiff, Newcastle, Leeds, Liverpool, Manchester, Birmingham, Leicester, Norwich, Oxford, Welwyn Garden City, London and Portsmouth (see map below).

Recruitment and screening started in November 1994 and were completed in March 1999.