31143
The area closest to the accident produced 66 diagnosed cases of chronic radiation syndrome , providing the bulk of the data about this condition .
 chronic radiation syndrome
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:
 chronic radiation syndrome