Reference	Objective	Design	Evidence
Antonelli et al. [433]	A multiple‐centre survey on the use in clinical practice of non‐invasive ventilation as a first‐line intervention for acute respiratory distress syndrome	PCS	3A+
Bulow and Thorsager [434]	Non‐invasive ventilation in do‐not‐intubate patients: 5‐year follow‐up on a 2‐year prospective, consecutive cohort study	RCS	4B+
Confalonieri et al. [435]	Hydrocortisone infusion for severe community‐acquired pneumonia: a preliminary randomized study	RCT	2C−
Confalonieri et al. [431]	Acute respiratory failure in patients with severe community‐acquired pneumonia. A prospective randomized evaluation of non‐invasive ventilation	RCT	2B+
Ferrer et al. [432]	Non‐invasive ventilation in severe hypoxaemic respiratory failure: a randomized clinical trial	RCT	2B+
Gorman et al. [436]	Corticosteroid treatment of severe community‐acquired pneumonia.	MA	1A+
Mundy et al. [430]	Early mobilization of patients hospitalized with community‐acquired pneumonia. Chest 2003; 124(3):883–889. Ref ID: 4438	PCS	3A+
Salluh et al. [437]	The role of corticosteroids in severe community‐acquired pneumonia: a systematic review	MA	1A+
Siempos et al. [438]	Adjunctive therapies for community‐acquired pneumonia: a systematic review	MA	1A+