How many international conferences has Dr. Roldan been invited to speak at?
Dr. Roldan has been invited to speak at more than 20 international conferences.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many international conferences has Dr. Roldan been invited to speak at?

### Input: Not applicable

### Response:
Dr. Roldan has been invited to speak at more than 20 international conferences.<|im_end|>