[1] Univ Penn, Perelman Sch Med, Dept Dermatol, Philadelphia, PA 19104 USA
[2] Univ Penn, Ctr Clin Epidemiol & Biostat, Dept Epidemiol & Biostat, Philadelphia, PA 19104 USA
[3] Univ Utah, Sch Med, Dept Dermatol, Salt Lake City, UT USA
[4] SUNY Buffalo, Sch Med, Dept Dermatol, Buffalo, NY 14260 USA
[5] Peachtree Dermatol Associates, Atlanta, GA USA
[6] Colorado Springs Dermatol Clin, Colorado Springs, CO USA
[7] DermDox Ctr Dermatol, Hazleton, PA USA
[8] Natl Psoriasis Fdn, Portland, OR USA