Well generally, if they're employed they're not terrible else word of mouth (if not lawsuits) would've made them unemployed [1] (Don't have English source). I live in a small country where that works. Also, by talking to them during your intake. When I recently needed oral surgery, the specialist recommend I'd use oxazepam and reassured me it'd work (I have fear for needles). The 2 procedures went great (one was common, one was a tad more complex). You can have a second opinion as well, if you're in doubt. If I'd have cancer I'd go to Antoni van Leeuwenhoek hospital [2]. It has a good name.

[1] https://nl.wikipedia.org/wiki/Medisch_tuchtcollege

[2] https://en.wikipedia.org/wiki/Antoni_van_Leeuwenhoekziekenhu...