{{Cite journal| doi = 10.4414/smw.2009.12952| issn = 1424-3997 (Electronic) 0036-7672 (Linking)| volume = 139| issue = 51-52| pages = 731–7| last1 = Nickel| first1 = C. H.| last2 = Stephan| first2 = F. P.| last3 = Dangel| first3 = M.| last4 = Blume| first4 = K.| last5 = Gehrisch| first5 = R.| last6 = Dumoulin| first6 = A.| last7 = Tschudin| first7 = S.| last8 = Keller| first8 = D. I.| last9 = Hirsch| first9 = H. H.| last10 = Widmer| first10 = A. F.| last11 = Bingisser| first11 = R.| title = First wave of the influenza A/H1N1v pandemic in Switzerland| journal = Swiss Med Wkly| date = 2009-11-18| pmid = 19918702}}