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Previous studies have demonstrated an increased risk of venous thromboembolism ( VTE ) associated with CPA / EE compared with conventional combined oral contraceptives ( COCs ) .
 venous thromboembolism, VTE, CPA, EE, oral contraceptives
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 venous thromboembolism, VTE, CPA, EE, oral contraceptives