1. NSAIDs vs acetaminophen in knee and hip osteoarthritis: a systematic review regarding heterogeneity influencing the outcomes 
S.P.J. Verkleij, P.A.J. Luijsterburg, A.M. Bohnen, B.W. Koes, S.M.A. Bierma-Zeinstra 
Osteoarthritis and Cartilage 
Volume 19, Issue 8, Pages (August 2011)
DOI: /j.joca
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1 Flowchart of the study selection.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Forest plot of SMD for pain improvement in NSAIDs vs acetaminophen stratified by location of OA.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions

4. Fig. 3 Funnel plot for publication bias.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions