Since I am a patient of the Bulgarian docs (Grozdinski and CCSVI team), I would say that this study is roughly true, but there is a certain percent of mistake in the results.
For example, when I was treated, I was in an acute state of relapse which was visible - I had difficulties walking. This had started 2 weeks prior to the surgery, I stayed for 4 days in the clinic and by the time I left, my walking had improved. This would have happened as a normal course of healing after the relapse, it always does in the same time frame. However, I had no immediate improvement after the surgery, the improving of my walking was already underway, so this was just temporal coincidence. There was no quicker healing and all the other symptoms that I sometimes have were still there. However, the doctors interpreted this as an immediate improvement of the surgery, and it was not, I am 100% sure about that.
I have had 3 more relapses after the surgery, which was a year ago. The first one was as severe as usual, but the next two were milder and I could take them with minor problems. They were about tingling and stiffening. So I would say that my improvements happened later. My veins are now 13 mm in the right jug and 7.5 in the left (they were .7 and 1.3 initially).
Therefore I would say that there is an approximate mistake of 10-20% in the results, but I believe that this is just as normal as with any other research. 10% don't change the implications - there are definitely positive results with CCSVI, and I believe with the stem cells in the future. Though we may feel like experimental mice, at least what we can be is healthy experimental mice.