804
METHODS : We conducted a randomized , double - blind , prospective , multicenter study comparing the nephrotoxic effects of an iso - osmolar , dimeric , nonionic contrast medium , iodixanol , with those of a low - osmolar , nonionic , monomeric contrast medium , iohexol .
 Disease: nephrotoxic; Chemical: iodixanol; Chemical: iohexol
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: nephrotoxic; Chemical: iodixanol; Chemical: iohexol