Effects of mechanical insufflation-exsufflation on ventilator-free days in intensive care unit subjects with sputum retention; a randomized clinical trial. - Kubota, Shota; Hashimoto, Hideki; Yoshikawa, Yurika; Hiwatashi, Kengo; Ono, Takahiro; Mochizuki, Masaki; Naraba, Hiromu; Nakano, Hidehiko; Takahashi, Yuji; Sonoo, Tomohiro; Nakamura, Kensuke (PLoS ONE, 2024)