[1] Univ Calif San Francisco, Dept Dermatol & Med, San Francisco, CA 94143 USA
[2] VAMC, San Francisco, CA USA
[3] Yu Huangding Hosp, Dept Dermatol, Shandong, Peoples R China
[4] Zunyi Med Coll, Guizhou, Peoples R China
[5] Yonsei Univ, Wonju Coll Med, Wonju, South Korea