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Flow diagram of literature search. Search string employed in the three different databases: Pubmed: ((((“Welding Fumes”) OR welder OR welding))) AND epigen*; Scopus: (TITLE-ABS-KEY (“Welding Fumes”) OR TITLE-ABS-KEY (welder) OR TITLE-ABS-KEY (welding)) AND (TITLE-ABS-KEY (epigen*)); ISI Web of Science: ALL = (“Welding Fumes” OR welder OR welding) AND ALL = (epigen*).
