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Pfirrmann, Christian W.A.; Metzdorf, Alexander; Elfering, Achim; Hodler, Jürg; Boos, Norbert (2006). Effect of aging and degeneration on disc volume and shape: A quantitative study in asymptomatic volunteers. Journal of orthopaedic research, 24(5), pp. 1086-1094. Hoboken, N.J.: Wiley 10.1002/jor.20113
