Before Germ Theory, you could simply resonate to specific frequencies and retune your body. Alas, this method didn't require prescriptions, wasn't overly profitable, and thus...

You have to wonder how many centuries these bells were used for prior to their removal across the world.

Much more research should be conducted into the frequency hospitals that treated illnesses back then—and that used the "Bells" as a major aid in their treatments.

They were all removed in short order. Interestingly, as I understand, there isn't any documentation as to how the efficacy of drugs was superior to that of resonating. Thus, it is undocumented (or documents destroyed) as to why this happened.