Supplement to: ABT-450/r-ombitasvir and dasabuvir with or without ribavirin for HCV.Ferenci, PBernstein, DLalezari, JAuthor informationThis appendix has been provided by the authors to give readers additional information about their work.New England Journal of Medicine 370(21), May 22, 2014.Copyright © 2014 Massachusetts Medical Society. All rights reserved.