Department of Pathophysiology, Faculty of Medicine, Oita University, Oita, Japan;
Department of Medical Engineering, Faculty of Allied Health Sciences, University of East Asia, Yamaguchi, Japan;
Daimon Clinic for Internal Medicine, Nephrology and Dialysis, Ishikawa, Japan;
Department of Clinical Pharmacology & Therapeutics, Faculty of Medicine, Oita University, Oita, Japan;
Department of Medical Engineering, Faculty of Health Sciences, Junshin Gakuen University, Fukuoka, Japan;
Department of Respiratory Medicine & Infectious Diseases, Faculty of Medicine, Oita University, Oita, Japan;
Mask; Oxygen; Ventilation; Positive-Pressure; Ventilation; Chronic; Obstructive; Pulmonary; Disorder;