Appendix A.

Search strings by database

Database	Search string
PubMed	(Pb OR “blood lead” OR “lead exposure” OR “Lead”[Mesh]) AND (“Executive Function”[Mesh] OR “Attention”[Mesh] OR “Cognition” [Mesh] OR “executive function” OR “cognitive development” OR “cognitive flexibility” OR “attentional control” OR “inhibition control” OR “working memory” OR app“neuropsychological tests”)
Embase	(‘lead blood level’/exp. OR ‘lead exposure’ OR ‘blood lead’) AND (‘executive function’/exp. OR ‘executive function’ OR ‘attention’/exp. OR ‘working memory’ OR ‘cognition’/exp. OR ‘cognitive development’ OR ‘cognitive flexibility’ OR ‘inhibition control’ OR ‘attentional control’)
PsycINFO	(mainsubject.Exact(“lead”) OR “lead exposure” OR “blood lead”) AND (mainsubject.Exact(“executive function” OR “cognition” OR “attention”) OR “executive function” OR “working memory” OR “inhibition control” OR “cognitive development” OR “cognitive flexibility” OR “attentional control” OR “neuropsychological tests”
Scopus	TITLE-ABS-KEY ((“blood lead” OR “lead exposure”) AND (“executive function” OR “working memory” OR “cognitive development” OR “cognitive flexibility” OR “attentional control” OR “inhibition control” OR “neuropsychological tests”))
Google Scholar	(“blood lead”) AND (“executive function” OR “working memory” OR “cognitive development” OR “cognitive flexibility” OR “attentional control” OR “inhibition control” OR “neuropsychological tests”)