Stuart
I went to the cleveland clinic after seeing a doctor at Ohio State Wexner center for several years. I was looking for answers for why I was having a range of SFN symptoms (I have now been diagnosed). The doctor was nice enough but he didn't have any new ideas for what could be done. He suggested a repeat skin biopsy among some other tests I had already had done in the columbus area. I was told by another doctor later that the Cleveland clinic is an excellent facility but not great at testing/treatment of neuropathies. They just had the same array of tests to offer. OSU actually has some of the more specialized tests including skin biopsy and QSART testing for SFN.
Hope this helps!