University of London - St. George's, University of London - St. George's, University of London - St. George's, University Hospitals Sussex NHS Foundation Trust, University of London - St. George's, University Hospitals of Leicester NHS Trust, West London NHS Trust, London School of Hygiene & Tropical Medicine, University of London - St. George's, Imperial College London - Department of Primary Care and Public Health, University of London - St. George's, University of London - St. George's and University of London - St. George's