920
18 patients , referred to a radiocontrast study , considered at risk because of preexisting renal insufficiency , were enrolled in a prospective , randomized , controlled trial , performed at the secondary care center of a 1 , 100 - bed private university hospital .
 Disease: renal insufficiency
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: renal insufficiency