Urech, R, J Balmer, and R Mierau. “Clinical Diagnosis Compared to Classification Criteria in in a Cohort of 54 Patients With Systemic Sclerosis and Associated Disorders”. Swiss Medical Weekly 137, no. 4142 (October 20, 2007): 586–590. Accessed November 28, 2024. https://smw.ch/index.php/smw/article/view/787.