Here is the CMT Uptime check phrase
PUBLICATIONS

Causal assessment of surrogacy in a meta-analysis of colorectal cancer trials

Elliott, Michael R; Li, Yun; Taylor, Jeremy M. G.; Sargent, Daniel J. (2011). Causal assessment of surrogacy in a meta-analysis of colorectal cancer trials. Biostatistics. 12(3), 478-492.