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  • The sponsored study with a relative risk of 1.5 has been reanalysed several times, yielding lower relative risks; after this failed to convince, a new reanalysis was sponsored by another company.
  • One sponsored study finding an increased risk has not been published.
  • Vandenbroucke JP, Helmerhorst FM, Frits R Rosendaal FR. Competing interests and controversy about third generation oral contraceptives. BMJ 2000; 320: 381.