Retrospective Cohort Study
                    
                        
                                World J Obstet Gynecol
                                6(2):8-15.
                                Published online May 10, 2017.
                                doi: 10.5317/wjog.v6.i2.8
                            
                            
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                                            Received: 08/24/2017
                                        
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                                            Revised: 10/10/2017
                                        
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                                            Accepted: 11/08/2017
                                        
                                
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