Collected data include basic study characteristics such as location and time period, sources of study subjects, age groups included, and other information about study design, including case definitions and participation rates.
While in theory an accurate measure of AIF could help reduce all of these sources of subject-to-subject variability, in practice measurement of the AIF may itself add uncertainty, rather than reduce it, and thus these uncertainties in many of the kinetic tracer model input parameters may lead to large uncertainties in the assessment of the vessel permeability parameters Ktrans and νe.
In order to uncover the potential influence of the sample sources (population or hospital-based), further research was conducted on the different sources of subjects.
After emerging as one of the main sources of subject-specific variation in the human genome, Single Nucleotide Polymorphisms (SNPs) are now routinely used to investigate the role of genetics in a wide spectrum of diseases [ 1].
The meta-analyses have limitations including a mixture of case-control and cohort designs, a mixture of incident and dead cases, a small number of prostate cancer in most studies, and different sources of subjects with potential selection bias.
In contrast to hardware systems, they avoid a possible source of subject discomfort, costly equipment, and potential for equipment failure.
In the past my dreams have been a source of subject matter.
(The military is a rich source of subjects for such studies, because it consists of large cohorts of closely matched individuals who do what they're told).
Historically, "documentation" emerged as a distinct discipline in the early 20th century, paralleling the rise of empirical research, which was to provide its main source of subjects.
Baseline ventricle/total intra-cranial volume values did not differ by source of subjects.
