title: Effects of Tai Chi Ball on Estrogen Levels, Bone Metabolism Index, and Muscle Strength of Perimenopausal Women.
authors.affiliation: Department of Health Promotion and Physical Education, Beijing Institute of Graphic Communication, Beijing, China.
authors.forename: Chunmei
authors.initials: C
authors.lastname: Xiao
authors.affiliation: Department of Health Promotion and Physical Education, Beijing University of Chemical Technology, Beijing, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Kang
authors.affiliation: Department of Wushu, Beijing Sport University, Beijing, China.
authors.forename: Yong-Chang
authors.initials: YC
authors.lastname: Zhuang