%0 Journal Article %T Diagnostic Modalities, Surrogate Markers of Disease Activity, and Tools for Outcome Measurements %D 2002 %J Cleveland Clinic Journal of Medicine %P SII-171-SII-179 %V 69 %N 4 suppl 2 %U https://www.ccjm.org/content/ccjom/69/4_suppl_2/SII-171.full.pdf