[1] Emory Univ, Sch Med, Dept Dermatol, Atlanta, GA 30322 USA
[2] Emory Univ, Sch Med, Emory Ctr Outcomes Res, Atlanta, GA 30322 USA
[3] Atlanta VA Med Ctr, Dept Hlth Serv Res & Dev, Atlanta, GA USA
[4] Atlanta VA Med Ctr, Div Dermatol, Atlanta, GA USA
[5] St Michaels Hosp, Inner City Hlth Res Unit, Toronto, ON M5B 1W8, Canada
[6] Univ Toronto, Dept Med, Toronto, ON, Canada
[7] SW Texas State Univ, Dept Dermatol, Dallas, TX USA
[8] VA Palo Alto Hlth Care Syst, Palo Alto, CA USA
[9] Stanford Univ, Sch Med, Dept Med, Stanford, CA 94305 USA
[10] Stanford Univ, Sch Med, Dept Hlth Res & Policy, Stanford, CA 94305 USA