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Kivistö JE, Rimpelä A, Mattila VM.Kivistö JE, et al. Among authors: mattila vm.Acta Paediatr. 2011 Dec;100(12):1596-602. doi: 10.1111/j.1651-2227.2011.02387.x.Acta Paediatr. 2011.PMID: 21689151