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  • Original Investigation March 2003

    Christine M. Gilroy, MD; John F. Steiner, MD, MPH; Tim Byers, MD, MPH; Howard Shapiro, PhD; William Georgian, MS
    TOPICS: echinacea preparation

    Arch Intern Med. 2003; 163(6):699-704. doi: 10.1001/archinte.163.6.699