PT - JOURNAL ARTICLE AU - Annette H M van der Helm-van Mil AU - Angela Zink TI - What is rheumatoid arthritis? Considering consequences of changed classification criteria AID - 10.1136/annrheumdis-2016-209629 DP - 2017 Feb 01 TA - Annals of the Rheumatic Diseases PG - 315--317 VI - 76 IP - 2 4099 - http://ard.bmj.com/content/76/2/315.short 4100 - http://ard.bmj.com/content/76/2/315.full SO - Ann Rheum Dis2017 Feb 01; 76