If a journal article is published with the searches developed by an information specialist from the medical library we expect to be at least an acknowledgement in the article. You can use a sentence such as: “The authors wish to thank n.n. from the Erasmus MC Medical Library for developing and updating the search strategies” where n.n. is the name of the information specialist that developed the search together with the researcher.
More and more often researchers choose to offer co-authorship to the information specialist. The librarian involved will then be co-responsible for the clarity and correctness of (parts of) the manuscript, especially the methods section where the search is described. When desired the information specialist can provide a text that described the search to be included in the methods section.