1553
Seventy - four per cent of patients with epileptogenic disorders seen at the Emergency Unit at Groote Schuur Hospital were on phenytoin and 11.6 % of these had blood levels in the toxic range .
 adverse effect: blood levels in the toxic range, phenytoin
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  blood levels in the toxic range, phenytoin 
Answer:
 adverse effect: blood levels in the toxic range, phenytoin