Medicine
Continuous positive airway pressure
Respiratory distress
Randomized controlled trial
Clinical trial
Cochrane Library
Surfactant therapy
Relative risk
CINAHL
Meta-analysis
Inclusion and exclusion criteria
Intensive care medicine
MEDLINE
Intubation
Pediatrics
Anesthesia
Surgery
Gestational age
Internal medicine
Pregnancy
Psychological intervention
Confidence interval
Alternative medicine
Pathology
Psychiatry
Biology
Obstructive sleep apnea
Genetics
Political science
Law