1967
While there are many etiologies of AUB , the one most likely among otherwise healthy adolescents is dysfunctional uterine bleeding ( DUB ) , which is characterizing any AUB when all possible underlying pathologic causes have been previously excluded .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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