3111
The authors report a case of Balint syndrome with irreversible posterior leukoencephalopathy on MRI following intrathecal methotrexate and cytarabine .
 adverse effect: Balint syndrome, cytarabine; adverse effect: Balint syndrome, methotrexate; adverse effect: posterior leukoencephalopathy, cytarabine; adverse effect: posterior leukoencephalopathy, methotrexate
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:  Balint syndrome, cytarabine; Balint syndrome, methotrexate; posterior leukoencephalopathy, cytarabine; posterior leukoencephalopathy, methotrexate 
Answer:
 adverse effect: Balint syndrome, cytarabine; adverse effect: Balint syndrome, methotrexate; adverse effect: posterior leukoencephalopathy, cytarabine; adverse effect: posterior leukoencephalopathy, methotrexate