DOI: 10.1055/s-00000072

Seminars in Reproductive Medicine

References

Kaunitz AM, Portman DJ, Hait H, Reape KZ.
Adding low-dose estrogen to the hormone-free interval: impact on bleeding patterns in users of a 91-day extended regimen oral contraceptive 
Contraception 2009; 79(5): 350-355  

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