89253
In the United States , it is estimated that there may be between 15,000 and 40,000 patients who are in a persistent vegetative state , but due to poor nursing home records exact figures are hard to determine .
 United States
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:
 United States