4. One died, one was horrible, one was a clinical trial (so several doctors with the same treatment plan) and 12 years with my current, awesome pdoc. Really one more but I only saw her once after the first died and that was only memorable because she recognized the bipolar before anyone else did but I was terrified at the diagnosis and left and did not return (and moved away 2 months later). So she doesn't really count although if I had been with her longer she probably would have.

And of course numerous ones IP over the years.