Effect of physical stimulation (gingival massage) on age-related changes in gingival microcirculation. - Wada-Takahashi, Satoko; Hidaka, Ko-ichi; Yoshino, Fumihiko; Yoshida, Ayaka; Tou, Masahiro; Matsuo, Masato; Takahashi, Shun-suke (PLoS ONE, 2020)