How many years of clinical research experience does Christina Brennan have?
Christina Brennan has more than 20 years of extensive clinical research experience.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many years of clinical research experience does Christina Brennan have?

### Input: Not applicable

### Response:
Christina Brennan has more than 20 years of extensive clinical research experience.<|im_end|>