Palchik N S, Laing T J, Connell K J, Daltroy L H, Friedman C P, Hull A L, Mazzuca S A
Department of Postgraduate Medicine and Health Professions Education, University of Michigan Medical School, Ann Arbor 48109-0201.
Arthritis Rheum. 1991 Feb;34(2):234-40. doi: 10.1002/art.1780340218.