Abstract: Considering that the majority of BD patients are from APLAR (Asia and Pacific League of Associations for Rheumatology) countries any diagnosis criteria for BD must have an adequate accuracy in these countries. The APLAR subcommittee for Behcet's Disease has set a prospective study to assess the accuracy of the existing diagnosis criteria. China, Iran, Japan, and Korea, the major countries with BD are participating to this study. The data from ...