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A proposed classification system to quantify relative HFM within the same subject. (A) Class 0 represents full-thickness hairs unaffected by AGA. (B–F) Classes 1–5 represent AGA-affected hairs benchmarked to Class 0, with miniaturization segmented by 20% increments per class.
Abbreviations: HFM, hair follicle miniaturization; AGA, androgenic alopecia.
