Exemestane in Reducing Breast Density in Postmenopausal Women at Risk for Breast Cancer

Mayo Clinic - Jacksonville, Jacksonville

Mayo Clinic Cancer Center, Rochester

Massachusetts General Hospital Cancer Center, Boston

Dana-Farber/Harvard Cancer Center at Dana Farber Cancer Institute, Boston

Beth Israel Deaconess Medical Center, Boston

Brigham and Women's Hospital, Boston

Arthur G. James Cancer Hospital and Solove Research Institute at Ohio State University, Columbus

Memorial Hospital of Rhode Island, Pawtucket

Margaret and Charles Juravinski Cancer Centre, Hamilton

Northwestern Ontario Regional Cancer Care at Thunder Bay Regional Health Sciences Centre, Thunder Bay

Princess Margaret Hospital, Toronto

Centre Hospitalier de l'Universite de Montreal, Montreal