Intervention for falls: reduced exercise and vitamin d supplementation among the institutionalized frail elderly. (May 2015) - Imaoka, M.; Higuchi, Y.; Todo, E.; Hirasima, K.; Kitagawa, T.; Ueda, T.; Ando, S.; Yasuoka, M.; Mizuno, T.; Nakamura, K.; Kurosaki, K.; Ikeuchi, M.; et al.