Then, the methodological definitions of primary and secondary outcomes were unspecified in numerous studies.
32 The considerable variation in the prevalence of sleep disturbances may be due to the different time periods, different target populations and different methodological definitions of sleep disturbances.
As part of the conceptual and methodological definitions of the present work we propose to estimate the rate of wastage among doctors, which would incorporate all those conditions in which a graduate from a medical school does not put into practice the knowledge gained from the school for the production of health services.
A recent review concluded that even if some evidence existed, articulating the nature of the relationship between culture/climate and ICU performance was difficult and stated that 'In particular, stronger methodological definitions and operationalizations of both culture and outcomes were recommended' [ 46].
First, there are the methodological differences on definition of costs, pain, etc.
Two reviews had stronger evidence, but with limitations due to methodological heterogeneity or definition of outcomes.
However, comparisons across the seven studies selected in this review were difficult because of methodological variations in definition of attrition, sample composition, and the factors considered potential predictors.
Two reviews [ 20, 35] were considered to have the strongest evidence, although even for these reviews there were limitations with methodological heterogeneity or definition of outcomes.
This article proposes a methodological approach for the definition of relationships and reasoning tasks for patent analysis by using patent ontologies, and provides a real illustration of its potential in the context of international flows of research knowledge.
