CT-based response assessment of advanced gastrointestinal stromal tumor: dual energy CT provides a more predictive imaging biomarker of clinical benefit than RECIST or choi criteria - Meyer, Mathias; Hohenberger, Peter; Apfaltrer, Paul; Henzler, Thomas; Dinter, Dietmar; Schönberg, Stefan; Fink, Christian (European journal of radiology, 2013)