Ameyaw EO, Woode E, Boakye-Gyasi E, Abotsi WK, Kyekyeku JO, Adosraku RK. Anti-allodynic and Anti-hyperalgesic Effects of an Ethanolic Extract and Xylopic Acid from the Fruits of Xylopia aethiopica in Murine Models of Neuropathic Pain. Pharmacognosy Research. 2014;6(2):172-179.