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Goldberg EJ, Singh K, Van U, Garretson R, An HS.Goldberg EJ, et al. Among authors: singh k.Spine J. 2002 Nov-Dec;2(6):408-14. doi: 10.1016/s1529-9430(02)00441-2.Spine J. 2002.PMID: 14589262
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Singh K, Vaccaro AR, Albert TJ.Singh K, et al.Spine J. 2004 Nov-Dec;4(6 Suppl):195S-201S. doi: 10.1016/j.spinee.2004.07.009.Spine J. 2004.PMID: 15541667Review.
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