Data Sources and Literature Search Strategy
The meta-analysis was conducted according to the Preferred Reporting
Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines and
registered in the Prospective Register of Systematic Reviews (PROSPERO
ID CRD42021236232).11 PubMed, Embase and Web of
Science were searched from inception to February 1, 2021 using the
following Medical Subject Heading (MeSH) terms, keywords and word
variants: “insulin dependent” or “type 1 diabetes” and “asthma”.
Reference lists of the electronically identified articles were manually
searched.