1503
As of 2014 , about 250 dead bodies had been cryopreserved in the United States , and 1,500 people had made arrangements for cryopreservation of their corpses .
 United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States