Which if the following would be a possible measurment of the aqi?

What is the best way to combat stereotypes in the workplace?

About how many individuals in the us go bankrupt each year due to medical bills?

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?