May 2020 in “Hair transplant forum international” This article introduces a revised NPRT classification system that includes diverse patterns of hair loss in both men and women, suggesting it as a universal tool for classification and documentation.
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September 2016 in “Hair transplant forum international” This article proposes enhancing the Norwood-Hamilton scale for assessing hair loss patterns but reports no new clinical results.
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January 2017 in “ARC journal of dermatology” This study introduced and evaluated Ahmad's NPRT system for documenting hair loss, finding it helpful in assessing the specific state of male pattern baldness in 500 patients.