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Among a total of 60 patients included in the study , 16 patients developed acute renal failure ( ARF ) on the second day after contrast material was injected ( 26 . 6 % ) .
 Disease: acute renal failure; Disease: ARF; Chemical: contrast
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: acute renal failure; Disease: ARF; Chemical: contrast