Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Stucki, G; Stucki, S; Brühlmann, P; Maus, S; Michel, B A (1995). Comparison of the Validity and Reliability of Self-Reported Articular Indices. Rheumatology, 34(8):760-766.