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Upper gastrointestinal haemorrhage is a serious complication of aspirin and clopidogrel ( dual ) anti - platelet therapy with a high morbidity and mortality .
 Upper gastrointestinal haemorrhage, aspirin; Upper gastrointestinal haemorrhage, clopidogrel
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:
 Upper gastrointestinal haemorrhage, aspirin; Upper gastrointestinal haemorrhage, clopidogrel