Cimicifuga species identification by high performance liquid chromatography-photodiode array/mass spectrometric/evaporative light scattering detection for quality control of black cohosh products - He, K; Zheng, B; Bai, N; Peng, T; Roller, M; Zheng, Q; Pauli, G F; Wang, H (J Chromatogr A, 2006)