1. From the Department of Surgery, Örebro Medical Center Hospital, Örebro; Departments of Surgery, Oncology, and Pathology, University Hospital, Uppsala; Departments of Pathology and Mammography, Falu Hospital, Falun; Department of Medical Epidemiology, Karolinska Institute, Stockholm, Sweden; and the Department of Epidemiology and Harvard Center for Cancer Prevention, Harvard School of Public Health, Boston, MA.