The impact of oral Polypodium leucotomos extract on ultraviolet B response: A human clinical study by Kohli, Indermeet, PhD, Shafi, Rubina, PhD, Isedeh, Prescilia, MD, Griffith, James L., MD, Al-Jamal, Mohammed S., MD, Silpa-archa, Narumol, MD, Jackson, Bradford, PhD, Athar, Mohammed, PhD, Kollias, Nikiforos, PhD, Elmets, Craig A., MD, Lim, Henry W., MD, Hamzavi, Iltefat H., MD

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