Quality assurance for Chinese herbal formulae: standardization of IBS-20, a 20-herb preparation by Bensoussan Alan, Sung Joseph JY, Tsai Sam-Hip, Tjong Yung-Wui, Zong Yuying, Chen Mengli, Xian Yanfang, Zhao Ming, Ip Siu-Po, Berman Brian, Fong Harry HS, Che Chun-Tao

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