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No single doctor wrote the original material. The doctor who wrote the original material for one area may be completely useless outside his area and ineffective at looking them up.

I agree... but the "best" doctor is also 5k miles away from me, and out of my immediately budget, since insurance doesn't cover it.. so.. I'll settle for "effective"

the best doctor wrote the original material

I agree with everything else in your comment, but that doesn't make sense. How do you arrive at that conclusion?

I am, admittedly, handwaving here. "Best" is so subjective that's hard to define, so I define it as "the ones who move the field forward with original work." In other contexts it could mean something completely different.

I see. Well I'd differentiate between a researcher and a clinician. The best researcher may not be the doctor you want diagnosing and treating you.