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In 1956 , however , the psychologist Evelyn Hooker performed a study comparing the happiness and well-adjusted nature of self-identified homosexual men with heterosexual men and found no difference .
 person: Evelyn Hooker
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Evelyn Hooker