1. LabGenomics Clinical Research Institute, LabGenomics, Seongnam, Korea;
2. Department of Obstetrics and Gynaecology, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, Korea;
3. Department of Obstetrics and Gynaecology, CHA Gangnam Medical Centre, CHA University, Seoul, Korea;
4. Department of Obstetrics and Gynaecology, CHA Bundang Medical Centre, CHA University, Seongnam, Korea;
5. Busan Paik Hospital, Inje University College of Medicine, Busan, Korea