[1] Univ Calif San Francisco, Vet Adm Med Ctr, San Francisco, CA 94121 USA
[2] Univ Calif San Francisco, Dept Dermatol, San Francisco, CA 94121 USA
[3] Univ Calif San Francisco, Serv Dermatol, REs Enhancement Award Program, Hlth Serv Res& Dev Serv,Dept Vet Affairs, San Francisco, CA 94121 USA
[4] Univ Calif San Francisco, Interdisciplinary Res Program Imrpove Care Older, REs Enhancement Award Program, Hlth Serv Res& Dev Serv,Dept Vet Affairs, San Francisco, CA 94121 USA
[5] Brown Univ, Rhode Isl Hosp, Dept Dermatol, Providence, RI 02912 USA
[6] Prov Vet Affairs Med Ctr, Dermatoepidemiol Unit, Providence, RI USA