ARDS	acute respiratory distress syndrome
CEPPIS	Chest Echocardiography and Procalcitonin Pulmonary Infection Score
Cl	confidence interval
ICU	intensive care units
OR	odds ratio
PEEP	positive end-expiratory pressure
RR	relative risk
SSS	subglottic secretion suction
VAP	ventilator-associated pneumonia
VT	tidal volume