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Butler RJ, Wilson BL, Johnson WG.Butler RJ, et al. Among authors: johnson wg.Health Econ. 2012 Feb;21(2):113-26. doi: 10.1002/hec.1699. Epub 2010 Dec 15.Health Econ. 2012.PMID: 22223556
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Butler RJ, Johnson WG.Butler RJ, et al. Among authors: johnson wg.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, Gray BP.Butler RJ, et al. Among authors: johnson wg.Prof Case Manag. 2007 Nov-Dec;12(6):316-27; quiz 328-9. doi: 10.1097/01.PCAMA.0000300404.07948.86.Prof Case Manag. 2007.PMID: 18030151
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Baldwin ML, Johnson WG, Butler RJ.Baldwin ML, et al. Among authors: johnson wg.Am J Ind Med. 1996 Jun;29(6):632-41. doi: 10.1002/(SICI)1097-0274(199606)29:6<632::AID-AJIM7>3.0.CO;2-L.Am J Ind Med. 1996.PMID: 8773723