Department of Pathophysiology;
Faculty of Medicine;
Oita University;
Oita;
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;
Catheters; Intratracheal; Intubation; Respiration; Suction; Tracheostomy; Ventilators;