Disease Severity Measures in a Population of Psoriasis Patients: The Symptoms of Psoriasis Correlate With Self-Administered Psoriasis Area Severity Index Scores - Alan B. Fleischer; Steven R. Feldman; Stephen R. Rapp; David M. Reboussin; M. Lyn Exum; Adele R. Clark; Veena Rajashekhar (1996)