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Marked improvement in glycemic control occurs in patients with type 2 diabetes ( T2DM ) shortly after Roux - en - Y gastric bypass surgery ( RYGB ) and before there is major weight loss .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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