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Mūhlemann, Kathrin; Alexander, E Russell; Weiss, Noel S; Pepe, Margaret; Schopfer, Kurt (1996). Risk Factors for Invasive Haemophilus influenzae Disease among Children 2–16 Years of Age in the Vaccine Era, Switzerland 1991–1993. International journal of epidemiology, 25(6), pp. 1280-1285. Oxford University Press 10.1093/ije/25.6.1280
