1. Department of Laboratory Medicine, Gyeongsang National University Hospital, Jinju, Korea.
2. Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Laboratory Medicine, Boramae Hospital, Seoul, Korea.
4. Seoul Metropolitan Government Public Cord Blood Bank (Allcord), Seoul, Korea.
5. Department of Obstetrics and Gynecology, Boramae Hospital, Seoul, Korea.