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De Medicina is a 1st-century BCE medical treatise by Aulus Cornelius Celsus , a Roman encyclopedist and possibly ( but not likely ) a practicing physician .
 Aulus Cornelius Celsus, Roman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aulus Cornelius Celsus, Roman