[1] Univ Illinois, Coll Med, Chicago, IL USA
[2] Morehouse Sch Med, Atlanta, GA USA
[3] Univ Penn, Perelman Sch Med, Dept Dermatol, Philadelphia, PA USA
[4] Univ Penn, Perelman Sch Med, 3400 Civ Ctr Blvd,7th Floor PCAM South,Room 773, Philadelphia, PA 19104 USA