The UKNSC screening programme appraisal criteria were accessed through the national UK screening portal [ 13].
Screening, quality appraisal and data extraction were independently undertaken by two investigators (RCB and VU), with discrepancies resolved by consensus.
Of the 255 references identified, 34 could not be obtained for screening and appraisal (web extra 1).
Grey literature refers to literature that is not published in peer reviewed journals or books [ 78] How many reviewers are required at each of the searching, screening and appraisal stages?
Rigorous screening and quality appraisal was undertaken considering the research design, methods and limitations of each manuscript.
The evaluation of the tool included an analysis of feasibility, consistency, ontology, inter-rater reliability, Boolean Factor Analysis, and a preliminary impact analysis (screening, scoping and appraisal).
2, 30 However, the validity of the A1c test for mass screening needs further appraisal in view of disagreement between diagnosis of diabetes based on blood glucose or A1c in some studies, 31, 32 although A1c was found to be a good diagnostic tool for diabetes in other studies.
The amount and position of the lips in relation to the face can also be estimated upon clinical screening, yet clinical appraisals were not included in the present study.
Together with France, Angela Merkel has called for a pan-European response jointly financing appraisal and screening centres in Greece and Italy, co-ordinating reprisals against traffickers and sharing out the numbers of asylum seekers.
Other important works on human capital by other authors included Mincer's book in 1974, Taubman and Wales' series of publications on schooling as human capital and as screening, and Schultz's appraisal of the development of research on human resources within the Bureau on the occasion of its 50th anniversary.
