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After being drugged and robbed after a night of drinking with teammate Alexei Gusarov , he suffered liver and vision problems , which hastened the end his career .
 Alexei Gusarov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Alexei Gusarov