what if you were not responsible for planning the menu, and you noticed that the portions provided were often very large? what resources could you use to understand the appropriate portion sizes for children.

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?