2005
PATIENTS AND METHODS : Patients with more than 50 % decrease in platelet count or thrombocytopenia ( < 150 x 10 ( 9 ) / L ) after exposure to heparin , who had a positive two - step antigen assay [ optical density ( OD ) > 0 . 4 and > 50 inhibition with high concentration of heparin ] were included in the study .
 Disease: thrombocytopenia; Chemical: heparin; Chemical: heparin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: thrombocytopenia, heparin, heparin 
Answer:
 Disease: thrombocytopenia; Chemical: heparin; Chemical: heparin