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Steurer-Stey, Claudia; Lagler, Leonie; Straub, Daniel A; Steurer, Johann; Bachmann, Lucas M (2007). Oral purified bacterial extracts in acute respiratory tract infections in childhood: a systematic quantitative review. European journal of pediatrics, 166(4), pp. 365-76. Berlin: Springer 10.1007/s00431-006-0248-3
