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RAD was theorized to be a clinical marker associated with anal sexual assault in children , and has been associated with other signs of sexual assault but also appears in children with severe chronic constipation and those subject to invasive medical treatments of the anus .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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