Hypericum perforatum Subspecies Angustifolium shows a Protective Activity on the Consequences of Unavoidable Stress Exposure at Lower Doses than Hypericum perforatum Perforatum - Usai, M; Leggio, B; Grappi, S; Nanni, G; Gambarana, C; Tolu, P; Giachetti, D; Montis, M G De (Pharmacopsychiatry, 2003)