Clinical Effects Produced by a Standardized Herbal Medicinal Product of Hibiscus sabdariffa on Patients with Hypertension. A Randomized, Double-blind, Lisinopril-Controlled Clinical Trial - Herrera-Arellano, Armando; Miranda-Sánchez, Judith; Ávila-Castro, Pedro; Herrera-Álvarez, Sara; Jiménez-Ferrer, Jesús Enrique; Zamilpa, Alejandro; Román-Ramos, Rubén; Ponce-Monter, Héctor; Tortoriello, Jaime (Planta Medica, 2007)