[1] Brown Univ, Warren Alpert Med Sch, Dept Dermatol, Providence, RI USA
[2] Brown Univ, Sch Publ Hlth, Dept Epidemiol, Providence, RI USA
[3] Brigham & Womens Hosp, Dept Med, Div Network Med, Boston, MA USA
[4] Rhode Isl Hosp, Dept Dermatol, 593 Eddy St,APC Bldg,10th Floor, Providence, RI 02903 USA