Fig 1.
Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) flow diagram outlining study screening, identification, inclusion and exclusion.
Table 1.
Definition of bronchiolitis used in the studies identified.
Table 2.
Characteristics and summary of results of herbal medicine studies.
Table 3.
Characteristics and summary of results of supplement studies.
Fig 2.
Assessment of risk of bias according to a recommended tool for randomized controlled trials by the Cochrane Handbook for Systematic Reviews of Interventions.
(a) Risk of bias summary showing review authors’ judgments about each risk of bias domain for 8 randomized controlled trials. (b) Risk of bias graph showing each risk of bias domain presented as percentages across the studies.