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
Thorsten Suess*, Cornelius Remschmidt, Susanne B Schink, Brunhilde Schweiger, Andreas Nitsche, Kati Schroeder, Joerg Doellinger, Jeanette Milde, Walter Haas, Irina Koehler, Gérard Krause and Udo Buchholz