What did Christina Brennan do before leading Northwell Health's senior clinical trials operations?
Christina Brennan oversaw experimental intervention implementations from initial study design through conclusion across hospital networks over decades.
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### Instruction:
What did Christina Brennan do before leading Northwell Health's senior clinical trials operations?

### Input: Not applicable

### Response:
Christina Brennan oversaw experimental intervention implementations from initial study design through conclusion across hospital networks over decades.<|im_end|>