1. Department of Obstetrics and Gynecology; Faculty of Medicine; Uludağ University; Bursa Turkey
2. Department of Obstetrics and Gynecology; Bursa Şevket Yilmaz Research and Education Hospital; Bursa Turkey
3. Department of Immunology; Faculty of Medicine; Uludağ University; Bursa Turkey
4. Department of Biostatistics; Faculty of Medicine; Uludağ University; Bursa Turkey