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.
Butler RJ, Johnson WG.Butler RJ, et al.Int J Health Econ Manag. 2016 Sep;16(3):269-283. doi: 10.1007/s10754-016-9190-8. Epub 2016 May 9.Int J Health Econ Manag. 2016.PMID: 27878677
Butler RJ, Johnson WG.Butler RJ, et al.Spine J. 2008 May-Jun;8(3):510-21. doi: 10.1016/j.spinee.2007.04.006. Epub 2007 May 25.Spine J. 2008.PMID: 17602887
Butler RJ, Johnson WG, Côté P.Butler RJ, et al.J Occup Environ Med. 2007 Feb;49(2):214-25. doi: 10.1097/jom.0b013e318032211d.J Occup Environ Med. 2007.PMID: 17293761