2147
The uncomplicated long - term use of adequately - dosed AZA and stable non - toxic metabolite levels could not acknowledge TPMT deficiency as a primary cause of the leukopenia .
 leukopenia, AZA
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 leukopenia, AZA