727
Further randomized studies are needed to confirm the safety and precise indications for the use of LMWH in patients with mechanical heart valves .
 Chemical: LMWH
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: LMWH 
Answer:
 Chemical: LMWH