849
Seven of these 12 patients had elevated serum ferritin levels in 1994 ; 6 of the 7 had further increases in 1998 , and 1 had a decrease , although the value remained elevated .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities:  
Answer:
 None