[1] Emory Univ, Sch Med, Div Rheumatol, Atlanta, GA 30322 USA
[2] Emory Univ, Dept Biostat & Bioinformat, Rollins Sch Publ Hlth, Atlanta, GA 30322 USA
[3] Emory Univ, Dept Behav Sci & Hlth Educ, Rollins Sch Publ Hlth, Atlanta, GA 30322 USA
[4] Emory Univ, Dept Hlth Policy & Management, Rollins Sch Publ Hlth, Atlanta, GA 30322 USA