[1] Columbia Univ, Coll Phys & Surg, Dept Dermatol, New York, NY USA
[2] Henry Ford Hosp, Dept Dermatol, Detroit, MI 48202 USA
[3] Univ Penn, Dept Dermatol, Philadelphia, PA 19104 USA
[4] Univ Penn, Dept Biostat, Philadelphia, PA 19104 USA
[5] Univ Penn, Dept Epidemiol, Philadelphia, PA 19104 USA
[6] Rhode Isl Hosp, Dept Dermatol, Dept Vet Affairs Med Ctr Providence, Dermatoepidemiol Unit, Providence, RI USA
[7] Brown Univ, Dept Community Hlth, Providence, RI 02912 USA
[8] Lewin Grp, Falls Church, VA USA
[9] Littell Grp, Woodstock, VA USA
[10] United Network Organ Sharing, Richmond, VA USA
[11] Quintiles Strateg Res Serv, Falls Church, VA USA