RT Journal Article SR Electronic T1 How do I know thee...? Let me count the ways. The varieties of medical evidence. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2373 OP 2374 VO 28 IS 11 A1 M B Urowitz YR 2001 UL http://www.jrheum.org/content/28/11/2373.abstract AB