[1] Ctr Dis Control & Prevent CDC, Div Viral Hepatitis, Mailstop G-37,1600 Clifton Rd, Atlanta, GA 30329 USA
[2] Henry Ford Hlth Syst, Div Gastroenterol & Hepatol, 2799 West Grand Blvd, Detroit, MI 48202 USA
[3] Henry Ford Hlth Syst, Publ Hlth Sci, 1 Ford Pl 3A, Detroit, MI 48202 USA
[4] Geisinger Med Clin, Dept Epidemiol & Hlth Serv Res, 100 North Acad Ave, Danville, PA 17822 USA
[5] Kaiser Permanente Northwest, Kaiser Permanente Ctr Hlth Res, 3800 North Interstate Ave, Portland, OR 97227 USA
[6] Kaiser Permanente Hawaii, Kaiser Permanente Ctr Hlth Res, 501 Alakawa St,Suite 201, Honolulu, HI 96819 USA