title: Are the number of joints involved or the presence of psoriasis still useful tools to identify homogeneous disease entities in juvenile idiopathic arthritis?
authors.forename: Alberto
authors.initials: A
authors.lastname: Martini
mesh_terms: D000293:Adolescent; D001171:Arthritis, Juvenile / Q000175:diagnosis*; D015535:Arthritis, Psoriatic / Q000175:diagnosis*; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007596:Joints / Q000503:physiopathology*; D008297:Male; D011237:Predictive Value of Tests; D011379:Prognosis; D011565:Psoriasis / Q000175:diagnosis; D018570:Risk Assessment; D012720:Severity of Illness Index