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Hi dance,
I've had it done. I think there are two kinds, injection and surface.
I had the needle test. I don't remember it being too painful but it is a bit uncomfortable. Kinda pinches a little like when you're having blood drawn, but the needle is much thinner.
I think the whole procedure lasted about an hour, maybe an hour and a half, but I also had a nerve conduction study done at the same time.
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