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SARS survivors had higher stress levels during the outbreak , compared with control subjects ( PSS - 10 scores = 19 . 8 and 17 . 9 , respectively ; P < 0 . 01 ) , and this persisted 1 year later ( PSS - 10 scores = 19 . 9 and 17 . 3 , respectively ; P < 0 . 01 ) without signs of decrease .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
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