Contamination can be avoided by carrying out a clustered study design, where clusters defined by geography or dental practice, for example, are the experimental unit assigned to one or more ...

“Dave is one of those rare examples of a scientist who ... measure mercury levels in fish and through the research determined that the toxic contamination was “coming from atmosphere and ...

The early failure of the CDC’s very first COVID-19 test kits was due to contamination and a design flaw ... and Human Services that blamed one CDC research lab for the problems, suggesting ...