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First, there is a possibility of selection bias as the study population selected from an outpatient movement disorder clinic with fewer number of PD patients in severe and/or end-stage of the disease.
The study population selected by PALGA consisted of 119 patients: 62 males and 57 females.
Due to the nature of the research conducted in these clinical trials, the study population selected could potentially be at higher risk for infection with HIV and other STIs.
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We added two questions concerning the study objective and population: i) was the selected objective similar to our objective, and ii) was the study population a selected population.
The study population was selected by a systematic 1 3 sampling procedure; every third person from each list was selected and approached for participation.
The study population was selected from residents of seven villages recruited for a community-cohort study.
The 176 household heads, which are 30.9% of the study population, were selected using random sampling technique based on the sampling frames and the principle of proportional allocation for each kebele (Table 1).
In most cases, sample sizes have been small and the study population highly selected and non-representative of the general population.
The study population was selected from the catchment area of the Swedish Björknäs primary health care center in the town of Boden in northern Sweden.
The study population was selected at the IMSS Medical Center of Mexico City.
The study population was selected from the Danish Lung Cancer Screening Trial DLCSTT).
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