Outcomes of extended oral contraceptive regimens with a shortened hormone-free interval to manage breakthrough bleeding.
                             
                            
                            
                                
                            
                            
                                
                            
                            
                            
                                
                                    
                                            
    Sulak PJ, Carl J, Gopalakrishnan I, Coffee A, Kuehl TJ. Outcomes of extended oral contraceptive regimens with a shortened hormone-free interval to manage breakthrough bleeding. Contraception. 2004 Oct; 70(4):281-7.