2.1 Search strategy
The International Register of Prospective Systematic Reviews (PROSPERO) and the Cochrane Library were searched for no similar studies. The systematic review protocol is registered on the PROSPERO website (www.crd.york.ac.uk/Prospero), number CRD42022326995. PubMed, EMBASE, Cochrane Library, Web of Science Core Collection and MEDLINE were searched up until April 01, 2021, which was conducted for any relevant randomized controlled trials (RCTs) of exercise-based PR in childhood asthma. The language restriction is English.
Taking into account the possible differences between different databases, the retrieval strategy was adjusted accordingly. Detailed search strategy and steps can be found in Appendix 1 of the Supplementary Material. Additionally, we also read citations to relevant articles retrieved to ensure inclusion.