AIS	Alveolar Interstitial Syndrome
BTS	British Thoracic Society
CPAP	Continuous Positive Airway Pressure
CRP	C-Reactive Protein
CXR	Chest X-rays
HSJD	Hospital Sant Joan de Deu
ICU	Intensive Care Unit
LRTI	Lower Respiratory Tract Infection
LUS	Lung Ultrasound
LUS-Sc	Lung Ultrasound Score
MeSH	Medical Subject Headings
mWCAS	Modified Wood Score
NIV	Non-Invasive Ventilation
OR	Odds Ratio
PAs	Pleural line Anomalies
PED	Pediatric Emergency Department
PICU	Pediatric Intensive Care Unit
PO2	Oxygen Partial Pressure
PRISMA	Preferred Reporting Items for Systematic Review and Meta-Analyses
RSV	Respiratory Syncytial Virus
SatO2	Oxygen Saturation
SCs	Subpleural Consolidations
TC	Body temperature
TP	True Positive
US	Ultrasound
WBC	White Blood Cells
WDFM	Modified Wood Downes Ferres Score
WDFS	Wood Downes Ferres Score