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The thickness of the inner retina was established as the distance between retinal nerve fiber layer and inner nuclear layer and was measured using the 1 , 000 mum caliper available in the OCT - SLO Spectralis .
 inner retina, retinal nerve fiber layer, inner nuclear layer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 inner retina, retinal nerve fiber layer, inner nuclear layer