Choi, Y.J., Park, S.Y., Kim, J.Y., Won, K.C., Kim, B.R., Son, J.K., et al. (2013) Combined treatment of betulinic acid, a PTP1B inhibitor, with Orthosiphon stamineus extract decreases body weight in high-fat-fed mice. Journal of Medicinal Food, 16, 2-8.