Section I: Introduction.
Katz
Warren A
WA
University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.
Rothenberg
Russell
R
D006801:Humans; D010146:Pain / Q000175:diagnosis* / Q000209:etiology; D059408:Pain Management; D010147:Pain Measurement; D017410:Practice Guidelines as Topic; D012216:Rheumatic Diseases / Q000150:complications*; D017211:Treatment Failure