What is Andrew Christlers area of expertise?
Andrew Christler is an expert in the areas of voice disorders, transgender voice, and swallowing difficulty.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Andrew Christlers area of expertise?

### Input: Not applicable

### Response:
Andrew Christler is an expert in the areas of voice disorders, transgender voice, and swallowing difficulty.<|im_end|>