Table 1.

Keywords used in each database platform

Database	Keyword or medical subject headings
MEDLINE	(((COVID-19) AND MIS-C) AND Autopsy) AND Pediatric) AND Histopathology
Research Square	(COVID-19 (OR) SARS-COV-2 (OR) PIMS-TS (OR) MIS-C) AND (pediatric (OR) Adolescent) AND (Autopsy (OR) Pathology)
Google Scholar	(COVID-19 (OR) MIS-C (OR) PIMS-TS) AND (Pediatric (OR) Adolescent) AND (Autopsy" (OR) "Histopathology)
PubMed	"childs"[All Fields] OR ("paediatrics"[All Fields] OR "pediatrics"[MeSH Terms] OR "pediatrics"[All Fields] OR "paediatric"[All Fields] OR "pediatric"[All Fields]) OR ("infant"[MeSH Terms] OR "infant"[All Fields] OR "infants"[All Fields] OR "infant s"[All Fields]) OR ("infant, newborn"[MeSH Terms] OR ("infant"[All Fields] AND "newborn"[All Fields]) OR "newborn infant"[All Fields] OR "neonatal"[All Fields] OR "neonate"[All Fields] OR "neonates"[All Fields] OR "neonatality"[All Fields] OR "neonatals"[All Fields] OR "neonates"[All Fields]) OR ("adolescences"[All Fields] OR "adolescency"[All Fields] OR "adolescent"[MeSH Terms] OR "adolescent"[All Fields] OR "adolescence"[All Fields] OR "adolescents"[All Fields] OR "adolescent s"[All Fields])) AND ("autopsied"[All Fields] OR "autopsy"[MeSH Terms] OR "autopsy"[All Fields] OR "autopsies"[All Fields] OR ("pathology"[MeSH Terms] OR "pathology"[All Fields] OR "pathologies"[All Fields] OR "pathology"[MeSH Subheading]) OR ("histopathologies"[All Fields] OR "pathology"[MeSH Subheading] OR "pathology"[All Fields] OR "histopathology"[All Fields] OR "pathology"[MeSH Terms]) OR "post-mortem"[All Fields] OR "post-humous"[All Fields] OR ("autopsy"[MeSH Terms] OR "autopsy"[All Fields] OR "necropsy"[All Fields] OR "necropsied"[All Fields] OR "necropsies"[All Fields]))) AND (allchild[Filter])
Science Direct	(COVID-19 (OR) SARS-COV-2 (OR) PIMS-TS (OR) MIS-C) AND (pediatric (OR) Adolescent) AND (Autopsy (OR) Pathology)
Scielo	( (COVID-19) OR (SARS-COV-2) OR (PIMS-TS) OR (MIS-C) OR (Multisystem inflammatory syndrome in children) OR (COVID-2019)) AND ((pediatric) OR (children) OR (Infant) OR (Neonate) OR (Adolescent)) AND ((Autopsy) OR (Pathology) OR (Histopathology) OR (Post-mortem) OR (Post-humous) OR (Necropsy))
Medrxiv	"COVID-19 AND pediatric AND Pathology" and full text or abstract or title "Autopsy"
Biorxiv	(COVID-19 (OR) SARS-COV-2 (OR) PIMS-TS (OR) MIS-C) AND (pediatric (OR) Adolescent) AND (Autopsy (OR) Pathology)