A pilot study of efficacy and safety of Plantago lanceolata and Primula veris, in the treatment of the common cold von Oliva, Alfonso Isabel, Monleon, Getino Antonio, Rada, Fernadez de Jauregui Diego, Oteiza, Larrechea Laura, Rodriguez, Gomez Sandra, Garromendiola, Garay Jon Kepa, Villa, Basterretxea Maite, Madrigal, Hormaechea Marisol, Jaio, Senra Iraide, del Otero, Sanz Laura, Ma

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