3297
A decrease in Hb levels between 2 and 5 g / dL was detected in 23 ( 11 . 4 % ) patients during the follow - up period .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 None