7126
Musculoskeletal complaints were the presenting symptoms in four of 44 children ( 9 % ) treated for relapsed Wilms ' tumors with ifosfamide , a derivative of cyclophosphamide .
 adverse effect: Musculoskeletal complaints, cyclophosphamide; adverse effect: Musculoskeletal complaints, ifosfamide
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:  Musculoskeletal complaints, cyclophosphamide; Musculoskeletal complaints, ifosfamide 
Answer:
 adverse effect: Musculoskeletal complaints, cyclophosphamide; adverse effect: Musculoskeletal complaints, ifosfamide