Fig. 1

Flow diagram of systematic literature search according to the BFIRev methodology. The three databases PubMed, SCOPUS, and Web of Science were searched as outlined in the “Methods” section. After duplicate removal, titles were screened to select papers for further screening of abstracts. Abstracts were screened for selecting full-text papers, and reference lists of the selected papers were screened for additional relevant papers. During the process, most titles and abstracts were excluded for reasons outlined in the side boxes. A total of nine relevant references were included in the review