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In 2013 , the American Veterinary Medical Association issued new guidelines for carbon dioxide induction , stating that a displacement rate of 30 % to 70 % of the gas chamber volume per minute is optimal for the humane euthanization of small rodents .
 American Veterinary Medical Association
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:
 American Veterinary Medical Association