21,000
Participants
Start Date
December 31, 2011
Primary Completion Date
December 31, 2014
Study Completion Date
December 31, 2014
London School of Hygiene and Tropical Medicine, London
General Practice Research Database, London
University College, London, London
University College, London
OTHER
General Practice Research Database
OTHER_GOV
London School of Hygiene and Tropical Medicine
OTHER