3908
RESULTS : Ophthalmologists at 15 institutions responded , reporting a total of 3 , 774 indocyanine green angiograms performed on 2 , 820 patients between June 1984 and September 1992 .
 indocyanine green
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 indocyanine green