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As of 2017 , there were 907 health insurance companies in the United States , although the top 10 account for about 53 % of revenue and the top 100 account for 95 % of revenue .
 United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States