51991
Dyslexia was clinically described by Oswald Berkhan in 1881 , but the term " dyslexia " was coined in 1883 by Rudolf Berlin , an ophthalmologist in Stuttgart .
 Oswald Berkhan, Rudolf Berlin, Stuttgart
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Oswald Berkhan, Rudolf Berlin, Stuttgart