Sentence:  Rather , it is typical of the thousands of quacks who use phony therapeutic devices to fatten themselves on the miseries of hundreds of thousands of Americans by robbing them of millions of dollars and luring them away from legitimate , ethical medical <WSD>treatment</WSD> of serious diseases . 
Meaning of the word marked with <WSD> tags:  care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury)