What has Dr. Christina Brennan focused on in her scholarly publications?
Dr. Christina Brennan has focused on the areas of carotid artery and valvular heart disease in her scholarly publications.
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### Instruction:
What has Dr. Christina Brennan focused on in her scholarly publications?

### Input: Not applicable

### Response:
Dr. Christina Brennan has focused on the areas of carotid artery and valvular heart disease in her scholarly publications.<|im_end|>