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In approximately 5 - 12 % of these cases , there are no demonstrable cardiac or non - cardiac causes to account for the episode , which is therefore classified as idiopathic ventricular fibrillation ( IVF ) .
 Disease: idiopathic ventricular fibrillation; Disease: IVF
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: idiopathic ventricular fibrillation; Disease: IVF