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Barnes, J., Barber, N., Wheatley, D. and Williamson, E.M. (2006) A pilot randomised, open, uncontrolled clinical study of two dosages of St. John's Wort (Hypericum perforatum) herb extract (LI-160) as an aid to motivational/behavioural support in smoking cessation. Planta Medica, 72 (4). pp. 378-382.