title: Reply.
authors.affiliation: Division of Viral Hepatitis, National Center for HIV/AIDS Viral Hepatitis, STD, and TB Prevention.
authors.forename: Chong-Gee
authors.initials: CG
authors.lastname: Teo
authors.affiliation: Research Data Center, National Center for Health Statistics.
authors.forename: Ajay
authors.initials: A
authors.lastname: Yesupriya
authors.affiliation: Office of Directors, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention.
authors.forename: Man-Huei
authors.initials: MH
authors.lastname: Chang
authors.affiliation: Division of Laboratory Systems, Center for Surveillance, Epidemiology, and Laboratory Services, Centers for Disease Control and Prevention, Atlanta, GA.
authors.forename: Lyna
authors.initials: L
authors.lastname: Zhang