4533
Sixteen patients on maintenance hemodialysis underwent dialysis with either cuprophane ( n = 8 ) or polymethylmethacrylate ( PMMA ; n = 8 ) membranes for 1 week and then switched to the opposite membrane during the second week .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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