When I pick out a specialist, I first consider whether they're convenient to either my home or work. This works very well for me. Any exception I've made to this policy, such as choosing a gynecologist on the recommendation of a general practice doctor I like, has resulted in my having to go way out of my way. My gynecologist is in Mandarin, for instance.
Pros: Tries to avoid hurting you if possible; his x-ray technology is cutting edge; good about financing
Cons: Tends to be paternalistic about explaining procedures, but is getting better
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