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.
Helfenstein A, Lankes M, Ohlert K, Varoga D, Hahne HJ, Ulrich HW, Hassenpflug J.Helfenstein A, et al.Spine (Phila Pa 1976). 2006 Feb 1;31(3):339-44. doi: 10.1097/01.brs.0000197412.70050.0d.Spine (Phila Pa 1976). 2006.PMID: 16449908
Akay I, Oxmann D, Helfenstein A, Mentlein R, Schünke M, Hassenpflug J, Kurz B.Akay I, et al. Among authors: helfenstein a.Osteoarthritis Cartilage. 2010 Mar;18(3):389-96. doi: 10.1016/j.joca.2009.10.015. Epub 2009 Dec 4.Osteoarthritis Cartilage. 2010.PMID: 19944200Free article.
Helfenstein A, Tammela P.Helfenstein A, et al.Bioinformatics. 2017 Apr 15;33(8):1205-1209. doi: 10.1093/bioinformatics/btw782.Bioinformatics. 2017.PMID: 28011767