@article{kaunitz_2010, 
  title={Cycle Control With a 21-Day Compared With a 24-Day Oral Contraceptive Pill: A Randomized Controlled Trial}, 
  volume={115}, 
  DOI={10.1097/aog.0b013e3181d7047e}, 
  publisher={Ovid Technologies (Wolters Kluwer Health)}, 
  author={Kaunitz}, 
  year={2010}
  }