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Although an association between exposure to bleomycin and the development of scleroderma has been suspected , few cases are reported .
 scleroderma, bleomycin
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:
 scleroderma, bleomycin