Retraction Note: Vaginal progesterone for prevention of preterm labor in asymptomatic twin pregnancies with sonographic short cervix: a randomized clinical trial of efficacy and safety
1 Department of Obstetrics and Gynecology, Mansoura University Hospitals, Mansoura University, Elgomhouria St, Mansoura, 35111, Dakahlia, Egypt.
2 Department of Obstetrics and Gynecology, Mansoura University Hospitals, Mansoura University, Elgomhouria St, Mansoura, 35111, Dakahlia, Egypt. [email protected].