Another note, your tatoos, if you have any. The inks can have metallic components which can warm up in the skin. Here in US they don't say much but in Germany they always point it out to tell them if it feel like it is getting warm and they would take a break. I have a large back piece and it clearly gets very warm in places when they do T spine but it has not been a problem so far.
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Nov 07: STALIF Fusion L5/S1 ACTIV-L ADR L4/L5
Nov 09: Prodisc-C ADR 2 level C 4/5/6
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