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The epidemiological studies that assessed the risk of venous thromboembolism ( VTE ) associated with newer oral contraceptives ( OC ) did not distinguish between patterns of OC use , namely first - time users , repeaters and switchers .
 venous thromboembolism, VTE, oral contraceptives, OC, OC
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, oral contraceptives, OC, OC