By Neil McIntosh, Dsc(Med), FRCP(Edin), FRCP(Lond), FRCPCH, Professor of Child Life and Health, University of Edinburgh, Edinburgh, UK; Peter J. Helms, MBBS, PhD, FRCP(Edin), FRCPCH, Professor of Child Health, University of Aberdeen, Aberdeen, UK; Rosalind L. Smyth, MA, MBBS, MD, FRCPCH, Brough Professor of Paediatric Medicine, University of Liverpool, Liverpool, UK; and Stuart Logan, MBChB, MSc(Epidemiology), MSc(Politics), MRCP, FRCPCH, Professor of Paediatric Epidemiology; Director, Institute of Health and Social Care Research, Peninsula Medical School, Exeter, UK |