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McCarthy JJ, Betz RR.McCarthy JJ, et al. Among authors: betz rr.Spine (Phila Pa 1976). 2000 Jan 15;25(2):211-3. doi: 10.1097/00007632-200001150-00011.Spine (Phila Pa 1976). 2000.PMID: 10685485
Mannherz RE, Betz RR, Clancy M, Steel HH.Mannherz RE, et al. Among authors: betz rr.Spine (Phila Pa 1976). 1988 Oct;13(10):1087-90. doi: 10.1097/00007632-198810000-00003.Spine (Phila Pa 1976). 1988.PMID: 3206264
Clements DH, Morledge DE, Martin WH, Betz RR.Clements DH, et al. Among authors: betz rr.Spine (Phila Pa 1976). 1996 Mar 1;21(5):600-4. doi: 10.1097/00007632-199603010-00013.Spine (Phila Pa 1976). 1996.PMID: 8852316
Ward M, Betz RR, Clements DH, Cole BA.Ward M, et al. Among authors: betz rr.Spine (Phila Pa 1976). 1997 Feb 15;22(4):406-7. doi: 10.1097/00007632-199702150-00010.Spine (Phila Pa 1976). 1997.PMID: 9055368