Effects of Heart Rate Variability Biofeedback Training on Anxiety Reduction and Brain Activity: a Randomized Active-Controlled Study Using EEG. - Saito, Ryuji; Yoshida, Kazuki; Sawamura, Daisuke; Watanabe, Akihiro; Tokikuni, Yukina; Sakai, Shinya (Applied Psychophysiology & Biofeedback, 2024)