1804
Cox proportional hazard analysis identified dialysis modality and pre - dialysis UV of less than 1 , 000 ml / m2 per 24 h as the only significant risk factors for UV survival .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None