Methods Study Design We used data from two prospective cohort studies, the Nurses’ Health Study (NHS, involving 121,700 women who were enrolled in 1976) and the Health Professionals Follow-up Study (HPFS, involving 51,500 men who were enrolled in 1986).
MethodsStudy DesignWe used data from two prospective cohort studies,the Nurses’ Health Study (NHS, involving 121,700women who were enrolled in 1976) and the HealthProfessionals Follow-up Study (HPFS, involving51,500 men who were enrolled in 1986).