Several factors can affect results: Age and sex Pregnancy Fasting status Hydration Recent exercise Acute illness Supplements and other medications Anemia Kidney function Weight and body-composition changes Laboratory methodology An abnormal result does not always indicate disease, and a normal result does not always exclude a clinically important problem
10.1210/en.2006-0153 [DOI] [PubMed] [Google Scholar] van Dijk, G
As an important guard against experimenter effects biasing results, participants, investigators, and outcome assessors were all not told participants experimental condition (i.e., they were kept blind to study condition)
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With Big Performance Who is the Star in the Star, RTL has launched a new entertainment show in which celebrities slip into the shoes of other successful singers with the help of make-up artists