Social Contacts and Mixing Patterns Relevant to the Spread of Infectious Diseases - Mossong, J; Hens, N; Jit, M; Beutels, P; Auranen, K; Mikolajczyk, R; Massari, M; Salmaso, S; Tomba, GS; Wallinga, J; Heijne, J; Sadkowska-Todys, M; Rosinska, M; Edmunds, WJ (PLoS Med, 2008)