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Biophysical skin parameters in never-smokers, smokers, and COPD subjects.
Notes: Panels showing measured biophysical skin parameters: (A) skin temperature, (B) melanin index, (C) erythema index, (D) sebum, (E) stratum corneum hydration, and (F) TEWL. *P<0.05; **P<0.01; ***P<0.001.
Abbreviations: COPD, chronic obstructive pulmonary disease; TEWL, transepidermal water loss.
