PT - JOURNAL ARTICLE AU - BOERBOOMS, AGNES M T H TI - Antiperinuclear factors are present in polyarthritis before ACR criteria for rheumatoid arthritis are fulfilled AID - 10.1136/ard.56.6.395a DP - 1997 Jun 01 TA - Annals of the Rheumatic Diseases PG - 395--396 VI - 56 IP - 6 4099 - http://ard.bmj.com/content/56/6/395.2.short 4100 - http://ard.bmj.com/content/56/6/395.2.full SO - Ann Rheum Dis1997 Jun 01; 56