It's often the case that a single clinic has a great medical treatment that doesn't spread to the rest of the world.

My favorite example is the Stone Clinic, which for decades has been treating osteoarthritis successfully by regrowing cartilage with stem cells from bone marrow. Extrapolated from their results, if the entire US used the Stone Clinic's methods, 98% of knee replacement surgeries would be unnecessary. But, for one reason or another, getting widespread adoption is really hard.

Stephen Badylak's clinic regularly regrows organs, but again, this hasn't scaled nationwide.

Francis Levi has found that chemotherapy has half the side effects and double the potency if you give it at night, when cancer cells are dividing but healthy cells have a slowed cell cycle. "Chronotherapy" for cancer is pretty much only available at his hospital.

As a patient, you could probably do much better than average by finding the clinic that does that one really good thing and going there.