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Fee splitting in the USA The situation in the USA is not entirely clear According to the World Medical Association , " The AMA Code provides that payment by or to a physician solely for the referral of a patient is unethical as is the acceptance by a physician of payment of any kind , and in any form , from any source such as a pharmaceutical company or pharmacist or a manufacturer of medical appliances and devices , for referring a patient to that source .
 World Medical Association, AMA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 World Medical Association, AMA