Composition and antioxidant activity of the essential oils of Xylopia aethiopica (Dun) A. Rich. (Annonaceae) leaves, stem bark, root bark, and fresh and dried fruits, growing in Ghana - Karioti,A.; Hadjipavlou-Litina,D.; Mensah,M.LK.; Fleischer,T.C.; Skaltsa,H. (J Agric Food Chem, 2004)