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Nickel, C H; Stephan, F P; Dangel, M; Blume, K; Gehrisch, R; Dumoulin, A; Tschudin, S; Keller, D I; Hirsch, H H; Widmer, A F; Bingisser, R (2009). First wave of the influenza A/H1N1v pandemic in Switzerland. Swiss Medical Weekly, 139(51-52):731-737.