any randomized controlled studies

I’ve been watching TIS for some time now – I’m going to get jumped on for this – but it still seems quite early and pricey to me relative to other stocks. Perhaps I’m just not able to find it, but are there any published studies of vitrogro? I’ve seen reference on the TIS website to a small (approx. 54 patient demonstration) but because I haven’t found any details or publication and it was not a controlled study, I have no way to know if this is better than would be achieved with standard treatment (approx 50% complete healing over 3 months is the published data) so the results may or may not be impressive. Does anyone know if there have been any randomized controlled studies conducted or published? I haven’t been able to find any, which makes me worry. If not why not? If yes, could someone please point me to the reference? Much appreciated. These controlled studies are essential to get reimbursement and acceptance among clinicians.