Primary outcomes
1. Exacerbations leading to emergency department visits.
2. Exacerbations requiring a course of oral corticosteroids.
Secondary outcomes
1. Functional health status (quality of life, days of restricted
activity, nights of disturbed sleep, day symptoms).
2. Days off school or caregiver days off work.
3. Exacerbations leading to hospitalisations.
4. Lung function (FEV1 (forced expiratory volume in one
second) and PEF (peak expiratory flow)).
5. Withdrawals from intervention or usual care.
1) sequence generation; 2) allocation concealment;
3) blinding; 4) incomplete outcome data; 5) selective
outcome reporting; 6) other bias.