Day care in relation to respiratory-tract and gastrointestinal infections in a German birth cohort study.
Zutavern A; Rzehak P; Brockow I; Schaaf B; Bollrath C; von Berg A; Link E; Kraemer U; Borte M; Herbarth O; Wichmann HE; Heinrich J; Acta Paediatrica (Oslo, Norway: 1992), 2007, vol. 96, issue 10, p 1494, ISSN 08035253. ISBN 08035253.

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