I didn't know medical schools allowed regional interviews. From what I've been reading, from most of the medical colleges I'm interested in, you have to interview on-campus at that college. No other exceptions permitted. I suppose there are a few limes in the basket of apples every now and then!
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Nature and Nature's laws lay hid in night,
God said "Let Newton be," and all was light.
I've always heard that it looks better to interview on campus as opposed to a regional. Supposedly it makes you look uninterested if you're not willing to make the trip to see them.