A randomised placebo-controlled trial of a traditional Chinese herbal formula in the treatment of primary dysmenorrhoea. - Yeh,L.L.; Liu,J.Y.; Lin,K.S.; Liu,Y.S.; Chiou,J.M.; Liang,K.Y.; Tsai,T.F.; Wang,L.H.; Chen,C.T.; Huang,C.Y. (PLoS One, 2007)