TABLE 1.

Search strategy for each database

Database	Search strategy
Pubmed	#1 ‘powdered vancomycin’ [MeSH Terms] OR ‘surgical site wound infections’ [All Fields] OR ‘deep and superficial’ [All Fields] #2 ‘powdered vancomycin’ [All Fields] OR ‘cranial surgery’ [All Fields] OR ‘spinal surgery’ [All Fields] #3 #1 AND #2
Embase	‘powdered vancomycin’/exp OR ‘surgical site wound infections’/exp OR ‘deep and superficial’ #2 ‘cranial surgery’/exp OR ‘spinal surgery’ #3 #1 AND #2
Cochrane library	(powdered vancomycin):ti,ab,kw (surgical site wound infections):ti,ab,kw OR (deep and superficial): ti,ab,kw (Word variations have been searched) #2 (cranial surgery): ti,ab,kw OR (spinal surgery): ti,ab,kw (Word variations have been searched) #3 #1 AND #2