You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Disease", "Chemical"].

Please return the output as a JSON object of the format: {"Chemical" : ["Naloxone", ...], "Disease" : ["Hypotensive", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Absolute and attributable risk of venous thromboembolism in women on combined cyproterone acetate and ethinylestradiol. OBJECTIVE: To achieve absolute risk estimates of venous thromboembolism (VTE) among women on cyproterone acetate plus ethinylestradiol (CPA/EE), and among women on combined oral contraceptives (COCs). METHODS: From the Danish National Register of Patients (NRP), 1996 to 1998, the records of 1.1 million Danish women, ages 15 to 44 years, were searched for evidence of VTE. COC use was ascertained through mailed questionnaires. Sales statistics of COCs and CPA/EE were provided through Danish Drug Statistics. RESULTS: During the time frame of the study, 330 women were found to have had VTE while on COCs. Of these women, 67 were on levonorgestrel-containing COCs. Eleven were on CPA/EE. The corresponding absolute risk of VTE was 3.4 (range, 3.1-3.8) per 10 000 women years among the women on COCs, 4.2 (range, 3.2-5.2) per 10 000 women years among women on levonorgestrel-containing COCs, and 3.1 (range, 1.3-4.9) per 10 000 women years among the women on CPA/EE. CONCLUSION: Our results suggest the absolute risk of VTE among Danish women on COCs is similar to that among women taking CPA/EE.
{"Chemical": ["ethinylestradiol", "levonorgestrel", "CPA", "cyproterone acetate", "EE", "combined oral contraceptives", "COC", "COCs"], "Disease": ["VTE", "venous thromboembolism"]}