4565
The aim of our study was to re - examine the association between risk of VTE and OC use with a different study design and analysis to avoid some of the bias and confounding of the earlier studies .
 Disease: VTE; Chemical: OC
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: VTE; Chemical: OC