Table 2. Search strategy.

PubMed	1 “rheumatoid arthritis”
	2 Arthritis, rheumatoid[Mesh]
	3 #1 OR #2
	4 “classification”
	5 “diagnostic criteria”
	6 “ACR EULAR”
	7 #4 OR #5 OR #6
	8 #3 AND #7
Embase	1 ‘rheumatoid arthritis’/exp AND [embase]/lim
	2 ‘classification criteria’ AND [embase]/lim
	3 acr AND eular
	4 #2 OR #3
	5 #1 AND #4 AND [embase]/lim AND [1-6-2009]/sd AND [2009–2012]/py
Cochrane	#1 MeSH descriptor Arthritis, Rheumatoid, this term only
	#2 rheumatoid arthritis
	#3 (#1 OR #2)
	#4 classification
	#5 diagnostic criteria
	#6 ACR EULAR
	#7 (#4 OR #5 OR #6)
	#8 (#3 AND #7)

Limits: humans, adults, from November 2009.