429
Metformin plasma concentrations remained unchanged except for patients transferred from 1 . 5 to 2 . 0 g daily to 850 mg twice daily ; in these patients plasma concentrations increased from 1 . 83 + / - 0 . 87 to 2 . 50 + / - 0 . 89 micrograms / l ( p less than 0 . 01 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None