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George SZ, Fritz JM, Erhard RE.George SZ, et al. Among authors: erhard re.Spine (Phila Pa 1976). 2001 Oct 1;26(19):2139-45. doi: 10.1097/00007632-200110010-00019.Spine (Phila Pa 1976). 2001.PMID: 11698893
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Fritz JM, Erhard RE, Delitto A, Welch WC, Nowakowski PE.Fritz JM, et al. Among authors: erhard re.J Spinal Disord. 1997 Oct;10(5):410-6.J Spinal Disord. 1997.PMID: 9355058
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