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Somsmorn Chittrakarn,Somsmorn Chittrakarn..[et al.]. Effects of kratom leaf extract on the rat gastrointestinal tract. Songkhla:Faculty of Science Prince of Songkla University, 2006. Print.
Somsmorn Chittrakarn,Somsmorn Chittrakarn..[et al.]. (2006) Effects of kratom leaf extract on the rat gastrointestinal tract. Faculty of Science Prince of Songkla University:Songkhla.