Antiperinuclear factors are present in polyarthritis before ACR criteria for rheumatoid arthritis are fulfilled
Jean-Marie Berthelot, Yves Maugars, Anne Castagné, Marie Audrain, Alain Prost
Annals of the Rheumatic Diseases Feb 1997, 56 (2) 123-125; DOI: 10.1136/ard.56.2.123
