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Burton A.K., Regional lumbar sagittal mobility: Measure-ment by flexicurves, Clinical Biomechanics, 1, pp. 20-26, (1986)
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Hellsing A.-L., Tightness of hamstrings and psoas muscles: A prospective study of back pain in the young men during their military service, Ups J Med Sci, 93, pp. 267-276, (1988)
[10]
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