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Pramana, Isabelle A; Latzin, P; Schlapbach, L J; Hafen, G; Kuehni, C E; Nelle, M; Riedel, T; Frey, U (2011). Respiratory symptoms in preterm infants: burden of disease in the first year of life. European journal of medical research, 16(5), pp. 223-230. München: I. Holzapfel 10.1186/2047-783X-16-5-223
