1. Scientific production and impact of national registers: the example of orthopaedic national registers 
P. Boyer, I. Boutron, P. Ravaud 
Osteoarthritis and Cartilage 
Volume 19, Issue 7, Pages (July 2011)
DOI: /j.joca
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
Flow diagram of the articles resulting from national arthroplasty registers, RCTs and meta-analyses.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
Cumulative number of publications per year resulting from national arthroplasty registers, RCTs and meta-analyses.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2011 Osteoarthritis Research Society International Terms and Conditions