TABLE 1.

Search strategy for each database

Database	Search strategy
Pubmed	#1 "COVID‐19"[MeSH Terms] OR "SARS‐CoV‐2"[All Fields] OR "adults"[All Fields] OR "children"[All Fields] #2 "clinical features"[MeSH Terms] OR "COVID‐19"[All Fields] OR "computerized tomography"[All Fields] OR "laboratory results"[All Fields] #3 #1 AND #2
Embase	'COVID‐19'/exp OR 'SARS‐CoV‐2'/exp OR ' adults'/exp OR children #2 'clinical features'/exp OR 'ICBG'/exp OR 'computerized tomography'/exp OR laboratory results #3 #1 AND #2
Cochrane library	(COVID‐19):ti,ab,kw (SARS‐CoV‐2):ti,ab,kw OR (adults):ti,ab,kw (Word variations have been searched) #2 (children):ti,ab,kw OR (clinical features):ti,ab,kw OR (computerized tomography):ti,ab,kw OR (laboratory results):ti,ab,kw (Word variations have been searched) #3 #1 AND #2