1. Department of Laboratory Medicine; National Health Insurance Service Ilsan Hospital; Goyang-si Korea
2. Department of Laboratory Medicine; Severance Hospital; Yonsei University College of Medicine; Seoul Korea
3. Department of Laboratory Medicine; Gangnam Severance Hospital; Yonsei University College of Medicine; Seoul Korea
4. Department of Obstetrics and Gynecology; National Health Insurance Service Ilsan Hospital; Goyang-si Korea