However, a large heterogeneity in methods for assessing the effectiveness of DGBL exist, leading to questions regarding reliability and validity of certain methods.
In contrast, relevant differences in the effectiveness of ALMP exist between youths with and without Austrian citizenship.
Evidence of the effectiveness of ANC interventions exists around the world when sought early in pregnancy and quality care continues until delivery [ 2, 4, 5].
7 8 Community based approaches to HIV counselling and testing have been implemented in several countries in sub-Saharan Africa, and an implementation handbook has been published by the World Health Organization, 9 but little rigorous evidence of the effectiveness of this approach exists.
Reviews of the effectiveness of carer interventions exist, but few have focused on educational interventions and none on the key elements that comprise them but which could inform evidence-based design.
While some codes have indicated certain tunnel features for the mitigation of debris hazards, no quantitative guidelines on the effectiveness of such features exist.
While evidence on the effectiveness of single programmes exists, it has not been reviewed systematically to establish empirically which types of programmes actually facilitate immigrants' employment uptake.
With a few exceptions, little evidence on the effectiveness of these treatments exists to date (5 7).
The effectiveness of phytoestrogens, which exist in nature not as single compounds but as complex mixtures in food matrices, as therapeutic agents for existing diseases is still unclear, but epidemiological studies indicate diets containing a significant amount of phytoestrogens seem to correlate with ERβ-mediated benefits (such as decreased incidence of breast and prostate cancers).
54 Lastly, analyses are carried out at the regional level, but important differences in costs and effectiveness of interventions may exist between countries in the same region.
