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He resigned on September 25 , writing in a letter to Bush : Johnson recalled speaking with the president in January : Secretary of Health and Human Services , Dr. Louis W. Sullivan , defended the administration 's record , citing " increased efforts in research , new therapies for those with H.I.V. , and extensive health-care services " .
 Health, Human Services, Louis W. Sullivan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Health, Human Services, Louis W. Sullivan