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Florack E, Obermann-de Boer G, van Kampen-Donker M, van Wingen J, Kromhout D.Florack E, et al.Acta Paediatr Scand. 1984 Nov;73(6):789-95. doi: 10.1111/j.1651-2227.1984.tb17777.x.Acta Paediatr Scand. 1984.PMID: 6524366