1. Department of Biochemistry, College of Medicine; The Catholic University of Korea; Seoul South Korea
2. Department of Molecular Science and Technology; Ajou University; Suwon South Korea
3. Department of Pathology, College of Medicine; The Catholic University of Korea; Seoul South Korea
4. Department of Islet Cell and Regenerative Biology, Joslin Diabetes Center and Department of Medicine; Harvard Medical School and Harvard Stem Cell Institute; Boston MA USA
5. Department of Pathology; Seoul National University College of Medicine; Seoul South Korea