Comparing the effectiveness of pattern differentiation treatment and fixed formula treatment for perimenopausal syndrome with Chinese herbal medicine: a study protocol di Hsu, Wingsze, Chan, Manhon, Zheng, Sirong, Li, Kingchung, Chan, Kamyin, Lam, Hoiyi, Chu, Tammy Tinyan, Chan, Siufung, Kwok, Yingching, Zhong, Linda Lidan

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