clinicallaboratory four phases of clinical trial phases of clinical trial clinical trial research belmont report beneficence justice principle of ethics informed consent randomized clinical trial cross sectional study cohort study interventional research observational research clinical research control products shift in qc trends in qc \ coefficient of variation open vial stability statistics in qc mean in qc precision in qc standard deviation selection of qc material qc high control normal control control shelf life westgard rules external quality control internal quality control qualitycontrol
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