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557 3 Stewart MF, Barclay J, Warburton R. Risk of giving intravenous aminophylline to acutely ill patients receiving maintenance treatment with theophylline. Br Med J 1984;288:450. 4 Grant IWB. Asthma in New Zealand. Br MedJ7 1983; 286:374-7. 5 Sears MR, Jones DT, Silva PA, Simpson A, Williams SM. Asthma in seven year old children: a report from the Dunedin multidisciplinary child development study. NZ Med J 1982;95:533-6. 6 Peckham C, Butler N. A national study of asthma in childhood. 7doi:10.1136/bmj.289.6444.557-a fatcat:d7tkrkhj5jahdna2uplnr5x4b4