1. Department of Laboratory Medicine, Konkuk University School of Medicine, Seoul, Korea
2. School of Public Health, Seoul National University, Seoul, Korea
3. Department of Medical-Surgery Sciences and Translational Medicine, School of Medicine and Psychology, ‘Sapienza’ University, Sant’Andrea Hospital, Rome, Italy
4. Department of Clinical and Molecular Medicine, School of Medicine and Psychology, ‘Sapienza’ University, Sant’Andrea Hospital, Rome, Italy
5. Sphingotec GmbH, Hennigsdorf, Germany