[1] Yale Sch Publ Hlth, New Haven, CT USA
[2] Univ South Carolina, Arnold Sch Publ Hlth, Columbia, SC USA
[3] Yale Univ, Harvey Cushing John Hay Whitney Med Lib, New Haven, CT USA
[4] FDA, Off Surveillance & Epidemiol, Silver Spring, MD USA
[5] US FDA, Silver Spring, MD USA
[6] FDA, Off Biostat, Silver Spring, MD USA
[7] Mayo Clin, Dept Emergency Med, Rochester, MN USA
[8] Yale Sch Med, New Haven, CT USA
[9] Emory Univ, Rollins Sch Publ Hlth, Atlanta, GA USA