PT - JOURNAL ARTICLE AU - Ronald L Koretz AU - Janus Christian Jakobsen AU - Christian Gluud TI - Letter to the editor re: Assessing the validity of surrogate endpoints in the context of a controversy about the measurement of effectiveness of hepatitis C virus treatment AID - 10.1136/bmjebm-2018-111072 DP - 2018 Dec 01 TA - BMJ Evidence-Based Medicine PG - 240--240 VI - 23 IP - 6 4099 - http://ebm.bmj.com/content/23/6/240.short 4100 - http://ebm.bmj.com/content/23/6/240.full SO - BMJ EBM2018 Dec 01; 23