868
Sirolimus - eluting stent thrombosis several years after clopidogrel discontinuation .
 Sirolimus - eluting stent thrombosis, 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:
 Sirolimus - eluting stent thrombosis, clopidogrel