First check to see if they accept Medicare (or if Medicare accepts them), I find if the treatment is not covered by Medicare it is probably shaky. Then you can try asking your primary care doctor, and of course there are the online reviews (treat these with care).
IMHO I avoid any treatment not covered by Medicare (not including Dental, vision, etc. which are not covered at all).
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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