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, A; Miranda-Sánchez, J; Avila-Castro, P; Herrera-Alvarez, S; Jiménez-Ferrer, J E; Zamilpa, A; Román-Ramos, R; Ponce-Monter, H; Tortoriello, J (Planta Med, 2007)