Has anyone used elf or fibrotest? how useful is it, does it correlate well with fibrosis?plz don't confuse with fibroscan or fib-4 scores, thanks

FibroTest=FibroSure: FibroSURE™ is a proprietary algorithm for fibrosis & inflammatory activity that has been validated in large prospective studies in Hepatitis C and NASH patients. Serum and/or imaging noninvasive tests can thus be used for prediction of at least moderate-stage disease in a global cohort of patients with chronic HCV, including the potential of high accuracy compared against liver biopsy.