The most studied transportation mode is road (by trucks), with air (by helicopters) coming second.
The metals featured in this volume are those about which there has been most public and scientific concern, and therefore are those most widely studied by fish researchers.
That may well be — most studies by Congressional oversight committees conclude that security has improved since 9/11 — but even the most bullish experts caution that there are still plenty of weak points in the system.
The asymmetric thermal boundaries bring the sunny-shady slope effect, which is investigated in most studies by comparing the temperatures difference between symmetric positions.
Economists have concentrated on explaining the increase in the "skill premium", measured in most studies by the ratio of the pay of workers with college degrees to that of high-school graduates.
Emphysema was defined in most studies by self-reported condition, however, a small number of studies employed either quantitative CT scan [45], [50] or radiographic evidence [51].
The evidence, although suggestive of a protective effect of barrier contraception, is not entirely consistent and interpretation is severely limited in most studies by the lack of detailed reliable evidence on contraceptive use.
Additionally, metabolic profiling of samples from patients (Box 1) would offer relevant information that may be hindered in most studies by the nutrient enriched, high oxygen conditions in which cell lines are cultured.
Because of our stratification of breast cancers into many groups, we share a limitation of most studies by molecular subtype, namely, small sample size within strata resulting in imprecise effect-measure estimates for each subtype.
