4North American Menopause Society. Estrogen and progestogen use in peri - and postmenopausal women: March 2007 position statement of The North American Menopause Society [J]. Menopause, 2007, 14:168 -82.
5Manson JE, Hsia J, Johnson KC. Women's Health Initiative In- vestigators: Estrogen plus progestin and the risk of coronary heart disease [J]. N Engl J Med, 2003, 349:523 -534.
6Wassertheil - Smoller S, Hendrix SL, Limacher M. Women 's Health Initiative Investigators : Effect of estrogen plus progestin on stroke in postmenopausal women: the Women~ Health Initi- ative: a randomized trial [J]. JAMA, 2003, 289:2673 -2684.
