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BACKGROUND : Treatment with angiotensin - converting enzyme ( ACE ) inhibitors reduces mortality and morbidity in patients with chronic heart failure ( CHF ) , but most affected patients are not receiving these agents or are being treated with doses lower than those found to be efficacious in trials , primarily because of concerns about the safety and tolerability of these agents , especially at the recommended doses .
 Chemical: angiotensin - converting enzyme ( ACE ) inhibitors; Disease: heart failure; Disease: CHF
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:
 Chemical: angiotensin - converting enzyme ( ACE ) inhibitors; Disease: heart failure; Disease: CHF