What are Dr. Christina Brennan's areas of research interest?
Dr. Brennan's areas of research interest encompass carotid artery disease and valvular heart disease.
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### Instruction:
What are Dr. Christina Brennan's areas of research interest?

### Input: Not applicable

### Response:
Dr. Brennan's areas of research interest encompass carotid artery disease and valvular heart disease.<|im_end|>