2-METHODS—SEARCH STRATEGY
The European Academy of Allergy and Clinical Immunology (EAACI) commissioned this PP. The appointed task force group (TF) performed a literature search in MEDLINE, PubMed, Web of Science, and Google Scholar databases of scientific societies, by using the keywords and combinations of keywords with the word and, including PPI ,Proton pump inhibitors , hypersensitivity reactions ,allergy , skin testing and provocation test . Through this search, the publications in the English language that reported the complete protocol followed were selected. Additionally, each TF member used extra keywords as appropriate for each specific section. During the development of the PP, the TF group consulted and discussed the process in meetings organized in June 2019 Lisbon/Portugal, and in October 2019 in Rimini/Italy. The TF members carefully reviewed the statements, recommendations, and unmet needs, including grading of the quality of evidence using the SIGN criteria as Grade A, B, C, D (Supplementary Table 1).10,11