RT Journal Article SR Electronic T1 Validation of the UCLA Scleroderma Clinical Trial Gastrointestinal Tract Instrument Version 2.0 for Systemic Sclerosis JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2498 OP 2498 DO 10.3899/jrheum.110060.C1 VO 38 IS 11 YR 2011 UL http://www.jrheum.org/content/38/11/2498.abstract AB