The role of facemasks and hand hygiene in the prevention of influenza transmission in households: results from a cluster randomised trial; Berlin, Germany, 2009-2011
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U. Buchholz | W. Haas | A. Nitsche | G. Krause | B. Schweiger | S. Schink | C. Remschmidt | Joerg Doellinger | K. Schroeder | T. Suess | J. Milde | I. Koehler