Study	Reason for exclusion
Gupta 2015	The study was published as a conference abstract. It included children presenting with first or second episodes of moderate to severe acute bronchiolitis. Trial authors responded, but could not provide additional data related to first episodes of bronchiolitis (inclusion criteria for this review).
Pruikkonen 2018	Study population did not match the review inclusion criteria. Trial authors included children with more than one episode of wheezing, while inclusion eligibility was limited to children with first episode of wheezing in this review, as per the definition by AAP Subcommittee 2006.
Rady 2018	This study included children with a wheezy chest from all causes, which is not part of our inclusion criteria. The trial authors stated that they included infants and children between 2 months and 12 years. However, the trial authors could not provide details of outcomes on children up to 2 years of age, which was part of our inclusion criteria for this review.