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Dr. Serdev is a graduate of the Sofia Medical University , and trained in General and then Cosmetic Aesthetic Surgery at the Military Medical Academy , and Aesthetic Surgery , Aesthetic Medicine Medical Center in Sofia , 1991-1996 he was a deputy head and acting head of the Burns Department in the Military Medical Academy and 2006-2008 National consultant in Cosmetic ( Aesthetic ) Surgery medical specialty at the Ministry of Health , Bulgaria .
 Serdev, Sofia Medical University, Medical, Medical, Sofia, Medical
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Serdev, Sofia Medical University, Medical, Medical, Sofia, Medical