Co-investigator (Co-I)

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Co-investigators (Co-I) refers to a senior or key investigator involved in a clinical study who does not have the overall responsibility and authority of the Principal Investigator (PI). A Co-I is expected to devote a specified amount of time to the project, makes significant contributions, and may be involved in developing and/or carrying out the project.

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NIH Grants and Funding Glossary and Acronym List
Patient-Centered Outcomes Research Institute (PCORI): Glossary

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