29505
METHODS : Efficacy and safety data ( probabilities of distal and proximal deep vein thrombosis , symptomatic pulmonary embolism , and major bleeding ) were derived from a systematic review and meta - analysis of phase II and III clinical trials .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None