Electronic searches
We performed a systematic search with no language restrictions of the following bibliographic databases: PubMed, Medline, Embase, BIOSIS citation index (BCI), and the Cochrane Library. Search terms included: “oral immunotherapy” or “oral tolerance” or “oral desensitization”, “milk allergy” or “milk hypersensitivity”. The search was up-to-date as of April 30, 2021. In addition, we reviewed the references of the articles included to identify potentially relevant citations.