Scanlon T J, Tomkins A, Lynch M A, Scanlon F
Centre for International Child Health, Institute of Child Health and Great Ormond Street Hospital for Children NHS Trust, University College London Medical School, London WC1N 1EH.
BMJ. 1998 May 23;316(7144):1596-600. doi: 10.1136/bmj.316.7144.1596.