Source	Terms and limits	Hits
WHO International Clinical Trials Registry Platform	Condition: Asthma exacerbation, date of registration from 1 March 2016 to present (any recruitment status, sponsor, location ). Condition: Asthma, Intervention: inhaled corticosteroids, date of registration from 1 March 2016 to present (any recruitment status, sponsor, location ).	40   18
AstraZeneca clinical trials	Terms: Asthma exacerbation, Phases 3 or 4, Therapeutic area: respiratory (any recruitment status, sponsor, location or product).	14
GlaxoSmithKline study register	Terms: asthma exacerbation, medical condition: asthma, Phases 3 or 4, study type: interventional (any recruitment status, phase, age, sex)	99
OpenGrey	Terms: asthma exacerbation	20
New York Academy of Medicine Grey Literature Report	Terms: asthma exacerbation	4