By vgreene, 24 December, 2014 C:Single or few observational studies or multiple studies w/ inconsistent findings/major limitations
By vgreene, 24 December, 2014 B:Trials/diagnostic studies w/ minor limitations; consistent findings from multiple observational studies
By vgreene, 24 December, 2014 A:Intervention—well-designed trials, meta-analyses; Diagnosis—independent gold standard studies
By vgreene, 24 December, 2014 Prematurity ≥29 wks gestation without CHD/CLDP/impaired airway clearance/immunocompromise