[1] Univ Maryland, Sch Med, Dept Dermatol, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Dept Epidemiol & Prevent Med, Baltimore, MD 21201 USA
[3] Univ Maryland, Sch Med, Dept Pathol, Baltimore, MD 21201 USA
[4] Univ Maryland, Sch Med, Dept Med, Baltimore, MD 21201 USA
[5] Univ Maryland, Sch Med, Dept Radiol, Baltimore, MD 21201 USA
[6] Baltimore Vet Affairs Med Ctr, Baltimore, MD USA