RT Journal Article SR Electronic T1 Sofosbuvir with ribavirin is safe and effective in hepatitis C genotype 1 with unfavourable pretreatment characteristics JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 90 OP 90 DO 10.1136/eb-2013-101592 VO 19 IS 3 A1 McKenzie C Ferguson YR 2014 UL http://ebm.bmj.com/content/19/3/90.abstract AB