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And some studies are not able to control for outside factors, like family situation or mood problems.
For nearly three decades, economic inequality has been widening, and some studies are suggesting that aside from the immigrant experience, the U.S. is not nearly as economically mobile — the ability of people to move up the ladder within a lifetime or from one generation to the next — as we would like to believe.
Retrospective and prospective studies are available and some studies are based on cases identified through cross sectional antibody prevalence studies.
In this case, the two published data sources may overlap (for example, they both constitute meta-analyses and some studies are included in both sources).
Abundant proteins evolve more slowly [ 5] and some studies are biased towards finding more protein-protein interactions for abundant proteins [ 6].
There are differences in general practice between countries that may affect patterns of patient visits and some studies are based on a limited number of practices, which may affect the generalisability of the findings [ 3, 15].
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Suicide survivors themselves have an elevated risk of suicide, and according to some studies are more vulnerable to depression, a risk factor for suicide.
Those lawyers are paid from the same pool of money as federal public defenders, but they cost much more and, according to some studies, are less effective.
The differential characteristics of study designs and participants in some studies are summarized in Table 1.
Some studies are complex and cross-sectoral.
Studies of the oceanography, geology, and sedimentology of the seafloor were made in the 1950s and '60s by American and British scientists working from naval hydrographic vessels and by oil company research scientists; later this work was continued by German and American research expeditions, and some studies were made in the northern gulf by the Kuwait Institute of Scientific Research.
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