Subject Recruitment and Retention

Conducting clinical research studies, and selecting appropriate subjects within the inclusion criteria is the key to a successful ethical scientific study (Dombey, Markel, & Derenzo, 2012). In any clinical trial, human subjects’ selection is directly related to the external validity, safety and efficacy assessment of the medicinal product in question. Thus, if the subjects selection were not within the inclusion/exclusion criteria or even when the subjects selection follows the inclusion/exclusion criteria, if the inclusion/exclusion criteria does not cover the necessary research variables or account for possible confounding factors, then the application of the investigational medicinal product to the rest of the population is an unacceptable problematic sequel, one which may cause serious life threatening consequences or become an unethical medical practice. Therefore, thorough evaluation of positive factors that affect subjects’ recruitment must be reasonable, and becoming reasonable, researchers must take into account the type of research question being addressed. Recruitment

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