Burden of influenza, healthcare seeking behaviour and hygiene measures during the A(H1N1)2009 pandemic in France: a population based study., Van Cauteren, Dieter, Vaux Sophie, de Valk Henriette, Le Strat Yann, Vaillant Veronique, and Lévy-Bruhl Daniel , BMC Public Health, 2012 Nov 05, Volume 12, (2012)