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Wang PC, Harrison RJ, Yu F, Rempel DM, Ritz BR.Wang PC, et al. Among authors: ritz br.Am J Ind Med. 2010 Apr;53(4):352-60. doi: 10.1002/ajim.20790.Am J Ind Med. 2010.PMID: 20017187Clinical Trial.
Zhao Y, Krishnadasan A, Kennedy N, Morgenstern H, Ritz B.Zhao Y, et al.Am J Ind Med. 2005 Oct;48(4):249-58. doi: 10.1002/ajim.20216.Am J Ind Med. 2005.PMID: 16167347
Krishnadasan A, Kennedy N, Zhao Y, Morgenstern H, Ritz B.Krishnadasan A, et al.Am J Ind Med. 2007 May;50(5):383-90. doi: 10.1002/ajim.20458.Am J Ind Med. 2007.PMID: 17407146Free article.
Rempel DM, Wang PC, Janowitz I, Harrison RJ, Yu F, Ritz BR.Rempel DM, et al. Among authors: ritz br.Spine (Phila Pa 1976). 2007 Apr 20;32(9):931-8. doi: 10.1097/01.brs.0000261028.88020.fc.Spine (Phila Pa 1976). 2007.PMID: 17450065Clinical Trial.