3787
Ancrod has been used successfully for prophylaxis against development of thrombosis in patients with heparin induced platelet aggregation who require brief reexposure to heparin , but its success in patients who have developed the thrombosis syndrome is not well defined .
 Disease: thrombosis; Chemical: heparin; Disease: platelet aggregation; Chemical: heparin; Disease: thrombosis
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:
 Disease: thrombosis; Chemical: heparin; Disease: platelet aggregation; Chemical: heparin; Disease: thrombosis