It talks about the birth control pills that cause blood clots.
The review also found that women on two other forms of birth control -- the Ortho Evra patch from Johnson & Johnson and the NuvaRing vaginal ring from Merck -- had a higher rate of clots.
Women taking birth control pills with a newer progestin hormone had twice the risk of clots compared to those who took the older form of contraceptive pills.
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