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Van Bel F, Van de Bor M, Walther FJ.Van Bel F, et al. Among authors: walther fj.Acta Paediatr Scand. 1991 Oct;80(10):905-10. doi: 10.1111/j.1651-2227.1991.tb11751.x.Acta Paediatr Scand. 1991.PMID: 1755295
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