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Smart and informative piece by {@Matthew Herper@} : Why would a Covid vaccine cause rare blood clots ? Researchers have found clues {{URL}} via {@STAT@}
 Matthew Herper, Covid vaccine, STAT
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 Matthew Herper, Covid vaccine, STAT