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  "Six months of disuse during hibernation does not increase intracortical porosity or decrease cortical bone geometry, strength, or mineralization in black bear (Ursus americanus) femurs."  Journal of Biomechanics.  Vol. 42 (2009): 1378-1383. 

  "Black bear femoral geometry and cortical porosity are not adversely affected by ageing despite annual periods of disuse (hibernation)."  Journal of Anatomy.  Vol. 210 (2007): 160-169. 

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