Parameters and functional tests appropriate to standardize hepatocyte differentiation and to compare differentiation procedures have been proposed, but are not validated until now.
But it should also be considered that no possible biomarker has been validated in large cohort studies until now [ 81].
The biochemical diagnosis of eIF2B-related disorder is difficult as no marker, except the recently described asialotransferrin/transferrin ratio measured in cerebrospinal fluid, has been proposed and validated until now.
The one-way sensitivity analysis suggests that the base case may be improved by reducing the clearance period from 120 to 30 days, a period commonly used to exclude readmissions but which until now had not been validated by population-level dataset.
However EDS has now been validated for screening during pregnancy.
This index has been validated and used in Netherlands, USA and UK until now.
Despite being commonly used in RA observational research [ 6- 8], CIRAS has not been validated against a clinical marker of RA severity until now.
Until now, the STEPP has not been validated in other languages or other broader trauma samples.
Until now, very few instruments had been validated to assess physical activity and sedentarism in Spanish children and adolescents.
