1. From the Public Health GIS Unit (R.M., T.P.), School of Health and Related Research, University of Sheffield, Sheffield, UK; the Division of Health and Social Care Research (N.C.S., C.D.W.), King's College London and National Institute for Health Research (NIHR) Biomedical Research Centre, Guy's and St Thomas' NHS Foundation Trust and King's College London, London, UK; Environmental Research Group (S.D.B.), King's College London, UK; and Health Services Research Section (M.J.C.), School of Health...