A systematic review process was adopted in ascertaining studies, thereby avoiding selection bias.
We applied the nested case-control design to ascertain study subjects and two control groups from the healthy population, investigating the high-order interaction of risk factors on steatohepatitis.
This geographically based, systematically ascertained study of some 28 000 patient-years of essentially untreated multiple sclerosis completes our assessment of the relationship of relapses to hard long-term outcome measures.
Because smoking has been shown to influence NAA/Cr levels regardless of alcohol consumption [ 23- 25, 35], we ascertained study participants who were non-smokers to avoid any additional effect of smoking on this investigation.
The National Cancer Institute's Clinical Genetics Branch (CGB) is conducting a multidisciplinary aetiologic study of familial testicular cancer aimed at ascertaining and studying families with TGCT.
An important exploratory study was conducted at the beginning of the FGDs to ascertain the study communities' definition and nomenclature for malaria.
In each trial, physicians and nurses ascertained that study patients were deeply sedated (with no response to glabellar tap) before initiating the study infusion.
Another involves mandating that researchers report their findings to relevant local institutions, empowering them to ascertain a study's implication and application as they craft solutions of their own.
Body mass index (BMI) was calculated from height and weight ascertained at study enrollment.
Mortality during hospitalization and after hospital discharge was ascertained by study nurses and the National Death Index search, respectively [27].
