What diagnostic and biofeedback tools does Andrew Christler use for GERD?
Andrew Christler uses endoscopy and FEES as diagnostic and biofeedback tools for GERD.
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### Instruction:
What diagnostic and biofeedback tools does Andrew Christler use for GERD?

### Input: Not applicable

### Response:
Andrew Christler uses endoscopy and FEES as diagnostic and biofeedback tools for GERD.<|im_end|>