COVID-19-related stress, exercise, and oral health-related quality of life among community-dwelling older adults who participated in the CHEER Iwamizawa project, Japan oleh Kazuhito Miura, Yutaka Watanabe, Haruhisa Baba, Kimiya Ozaki, Takae Matsushita, Miyako Kondoh, Kazutaka Okada, Shinji Nakaoka, Katsuhiko Ogasawara, Teppei Suzuki, Hiroshi Saito, Takashi Kimura, Akiko Tamakoshi, Yutaka Yamazaki