Perceptual variation in grading hand, hip and knee radiographs: observations based on an Australian Twin Registry study of osteoarthritis
Nicholas Bellamy, Paul Tesar, Duncan Walker, Alexander Klestov, Kenneth Muirden, Petra Kuhnert, Kim-Anh Do, Louise O'Gorman, Nicholas Martin
Annals of the Rheumatic Diseases Dec 1999, 58 (12) 766-769; DOI: 10.1136/ard.58.12.766