In how many countries has Dr. Barrera lectured?
Dr. Barrera has lectured in over 15 countries.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
In how many countries has Dr. Barrera lectured?

### Input: Not applicable

### Response:
Dr. Barrera has lectured in over 15 countries.<|im_end|>