Okamoto, T., Shimozuma, K., Katsumata, N., Koike, M., Hisashige, A., Tanaka, K., Ohsumi, S., Saito, M., Shikama, N., Mitsumori, M., Yamauchi, C., Watanabe, T., and Task Force of the Japanese Breast Cancer Society for 'The Development of Guidelines for Quality of Life Assessment Studies of Breast Cancer, Patients