[1] Boston Univ, Med Ctr, Sch Publ Hlth,Dept Epidemiol & Biostat, Canc Prevent & Control Ctr, Boston, MA 02118 USA
[2] Connecticut Dept Publ Hlth, Hartford, CT 06134 USA
[3] Boston Univ, Sch Med, Dept Dermatol, Boston, MA 02118 USA
[4] Massachusetts Dept Publ Hlth, Boston, MA 02108 USA
[5] Boston Univ, Sch Publ Hlth, Dept Hlth Serv, Boston, MA 02118 USA
[6] Brigham & Womens Hosp, Ctr Biometry, Multipurpose Arthrit Ctr, Boston, MA 02115 USA