I wasn't conscious of much vibration, but there are also lots of other reasons I could have felt some oddities. I suspect magnetic induction on the nerves (but for all I know, I have nerves of just the right length to light up with the RF pulse). Fortunately, it wasn't painful, just odd, and mostly very subtle. I'm glad it was as easy as it was. Now I only dread finding out how expensive it was... :-)
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