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We present the case of an adult Crohn 's disease patient with a parvovirus B19 infection and leukopenia during long - term AZA therapy .
 adverse effect: leukopenia, AZA
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:  leukopenia, AZA 
Answer:
 adverse effect: leukopenia, AZA