RT Journal Article SR Electronic T1 Surrogates of Survival JF Science Translational Medicine FD American Association for the Advancement of Science SP 130ec69 OP 130ec69 DO 10.1126/scitranslmed.3004168 VO 4 IS 130 A1 Oviedo-Orta, Ernesto YR 2012 UL http://stm.sciencemag.org/content/4/130/130ec69.abstract