[1] Corporal Michael J Crescenz Vet Affairs Med Ctr, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Dermatol, Perelman Sch Med, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Biostat & Epidemiol, Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Changi Gen Hosp, Dept Dermatol, Singapore, Singapore
[5] Univ Tsukuba, Dept Dermatol, Fac Med, Ibaraki, Japan
[6] Kanazawa Univ, Dept Dermatol, Grad Sch Med Sci, Kanazawa, Ishikawa, Japan