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In four patients , thrombosis occurred 2 - 45 days after severe hepatic veno - occlusive disease ( HVOD ) secondary to intensive chemotherapy containing busulfan .
 adverse effect: hepatic veno - occlusive disease, busulfan; adverse effect: HVOD, busulfan; adverse effect: thrombosis, busulfan
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:  hepatic veno - occlusive disease, busulfan; HVOD, busulfan; thrombosis, busulfan 
Answer:
 adverse effect: hepatic veno - occlusive disease, busulfan; adverse effect: HVOD, busulfan; adverse effect: thrombosis, busulfan