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C. Ratzlaff, M. Koehoorn, J. Cibere, J. Kopec 

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1 Clinical validation of an Internet-based questionnaire for ascertaining hip and knee osteoarthritis 
C. Ratzlaff, M. Koehoorn, J. Cibere, J. Kopec  Osteoarthritis and Cartilage  Volume 20, Issue 12, Pages (December 2012) DOI: /j.joca Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

2 Fig. 1 Subject recruitment.
Osteoarthritis and Cartilage  , DOI: ( /j.joca ) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions


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