9 citations
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October 2016 in “Forensic science international” Hair area varies with age and sex, but hair index and medullary index do not.
20 citations
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January 2011 in “Skin Research and Technology” Aging makes hair thinner and rougher, with less clear edges.
117 citations
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November 2005 in “Ultramicroscopy” Human hair's strength and flexibility vary by ethnicity, damage, and treatment.