Which of the following choices is not a common injury in sports?

a.

concussion and muscle strains

b.

hemorrhage and arthritis

c.

ligament strains and tears

d.

bone fractures and ankle sprains

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?