RT Journal Article SR Electronic T1 Bosentan for Digital Ulcers in Patients with Systemic Sclerosis: A Prospective 3-year Followup Study JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1550 OP 1551 DO 10.3899/jrheum.080992 VO 36 IS 7 A1 NIKI TSIFETAKI A1 VASSILIOS BOTZORIS A1 YANNIS ALAMANOS A1 EVAGGELIA ARGYRIOU A1 AIKATERINI ZIOGA A1 ALEXANDROS A. DROSOS YR 2009 UL http://www.jrheum.org/content/36/7/1550.abstract AB