1. Department of Family Medicine and Cancer Prevention Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Division of Breast and Endocrine Surgery, Department of Surgery and Samsung Comprehensive Cancer Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Family Medicine and Samsung Comprehensive Cancer Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.