Ulipristal acetate versus levonorgestrel for emergency contraception: a randomised non-inferiority trial and meta-analysis

Authors: Anna Glasier, Sharon Cameron, Paul Fine, Susan JS Logan, William Casale, Jennifer Van Horn, Laszlo Sogor, Diana Blithe, Bruno Scherrer, Henri Mathé, Amelie Jaspart, André Ulmann, Erin Gainer - The Lancet 2010 cited by 525