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Continue to ChatEuropean multicentre study to define disease activity criteria for systemic sclerosis. II. Identification of disease activity variables and development of preliminary activity indexes - https://avesis.istanbul.edu.tr/yayin/6b9113a0-a5e9-46a6-a8c6-05df9593e1dc/european-multicentre-study-to-define-disease-activity-criteria-for-systemic-sclerosis-ii-identification-of-disease-activity-variables-and-development-of-preliminary-activity-indexes