Effects of a Combination of Elderberry and Reishi Extracts on the Duration and Severity of Respiratory Tract Infections in Elderly Subjects: A Randomized Controlled Trial by Carlos Gracián-Alcaide, Jose A. Maldonado-Lobón, Elisabeth Ortiz-Tikkakoski, Alejandro Gómez-Vilchez, Juristo Fonollá, Jose L. López-Larramendi, Mónica Olivares, Ruth Blanco-Rojo

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