One of my better friend's father is one of the best kidney doctors in Sweden. I talked to him about companies providing dialysis and he suggests that "the more, the better" a dialysis treatment is. He suggested the trend of recent years that increased amount of treatment for dialysis patients is very likely to continue as we grow richer, as it leads to a noticable improvement in the well-being of the patients.
Sure, you shouldn't ask the barber whether you need a haircut, but I find that this thesis goes well with my basic knowledge in medicine.
I looked through a couple of 10-Ks for DVA, and I cannot say I understand the investment thesis at the current price (although I would rather bet on the ability of Ted than myself).