GRAPPA-OMERACT initiative to standardise outcomes in psoriatic arthritis clinical trials and longitudinal observational studies.
William TillettAna-Maria OrbaiPhilip S HelliwellYing Ying LeungVibeke StrandDafna D GladmanPhillip J MeaseLaura C Coatesnull nullPublished in: Annals of the rheumatic diseases (2017)