An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Rösler H, Birrer A, Lüscher D, Kinser J.Rösler H, et al. Among authors: birrer a.Schweiz Med Wochenschr. 1992 Nov 28;122(48):1843-57.Schweiz Med Wochenschr. 1992.PMID: 1462145Review.German.
Dreyfus A, Marfurt J, Birrer A, Matter HC, Raeber PA.Dreyfus A, et al. Among authors: birrer a.Euro Surveill. 2008 May 29;13(22):18892.Euro Surveill. 2008.PMID: 18761960Free article.Review.No abstract available.
Brinkhof MW, Spoerri A, Birrer A, Hagman R, Koch D, Zwahlen M.Brinkhof MW, et al. Among authors: birrer a.Swiss Med Wkly. 2006 May 13;136(19-20):302-9. doi: 10.4414/smw.2006.11373.Swiss Med Wkly. 2006.PMID: 16741853Free article.