What roles does Prof. David Sable currently serve on the Board of Directors for?
Professor David Sable currently serves on the Board of Directors for UNICEFUSA and the International Special Olympics.
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### Instruction:
What roles does Prof. David Sable currently serve on the Board of Directors for?

### Input: Not applicable

### Response:
Professor David Sable currently serves on the Board of Directors for UNICEFUSA and the International Special Olympics.<|im_end|>