Bang HS, Seo DY, Chung YM, Oh KM, Park JJ, Arturo F, Jeong SH, Kim N, , Han J.  Ursolic Acid-Induced Elevation of Serum Irisin Augments Muscle Strength During Resistance Training in Men.  Korean J Physiol Pharmacol 2014;18:441-446.  https://doi.org/10.4196/kjpp.2014.18.5.441