 Its latest edition was published in November 2012 and it identified a number of underperforming hospitals in England and a higher risk of avoidable mortality at the weekends.The Dr Foster Unit at Imperial College London was established in 2000 within the Division of Epidemiology, Public Health and Primary Care, part of the Faculty of Medicine at Imperial College London.The unit is funded through a grant from Dr Foster Intelligence and also receives funding from the Centre for Patient Safety and Service Quality (CPSSQ) and Centre for Infection Prevention and Management.