1 Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, South Korea.
2 Howard Hughes Medical Institute, University of California, San Diego, Department and School of Medicine, La Jolla, California, USA.
3 Howard Hughes Medical Institute, Department of Medicine, University of California, Los Angeles, Los Angeles, California, USA.
4 Institute of Clinical Chemistry and Pathobiochemistry, Charite - Campus Benjamin Franklin, Hindenburgdamm 30, Berlin, Germany.
5 Department of Medicine, Division of Endocrinology and Metabolism, School of Medicine, University of California, San Diego, San Diego, California, USA.
6 Howard Hughes Medical Institute, University of California, San Diego, Department and School of Medicine, La Jolla, California, USA. mrosenfeld@ucsd.edu.
7 Department of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, South Korea. sbaek@snu.ac.kr.