1. 
   PA (physician assistant)
   PA (physician assistant): A physician assistant (a PA) is a mid-level medical practitioner who works under the supervision of a licensed doctor (an MD) or osteopathic physician (a DO). The physician assistant came about in the 1960s as a response to the need for more clinicians (there was a shortage...
   Found op http://www.medterms.com/script/main/art.html?articlekey=8588
   
   

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