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Reye syndrome ( RS ) is believed to occur infrequently among children receiving long - term aspirin therapy .
 Reye syndrome, aspirin; RS, aspirin
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:
 Reye syndrome, aspirin; RS, aspirin