RT Journal Article SR Electronic T1 Calcium Pyrophosphate Crystals Detected by Ultrasound in Patients without Radiographic Evidence of Cartilage Calcifications JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2602 OP 2603 DO 10.3899/jrheum.100653 VO 37 IS 12 A1 MARWIN GUTIERREZ A1 LUCA DI GESO A1 EMILIO FILIPPUCCI A1 WALTER GRASSI YR 2010 UL http://www.jrheum.org/content/37/12/2602.abstract AB