Laboratory study of effects of Yifuning soft capsules on postmenopausal osteoporosis Curative effect of Xianling Qianggu koufuye on postmenopausal osteoporosis Effects of Yifuning soft gelatin capsules on pathology and biomechanical indexes of ovariectomied ra Effects of Migu tablet on bone mineral density, serum matrix metalloproteinase-2 level and bone metabolic markers in postmenopausal osteoporosis