1. Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine (N.K., T.A., Y.H., K.M., K.N.), Kyoto 606-8507, Japan
2. Ghrelin Research Project, Department of Experimental Therapeutics, Translational Research Center, Kyoto University Hospital, Kyoto University School of Medicine (T.A., K.T., H.H., K.K.), Kyoto 606-8507, Japan
3. Clinical Research Institute, Center for Endocrine and Metabolic Diseases, Kyoto National Hospital (T.T.), Kyoto 612-8555, Japan
4. Department of Biochemistry, National Cardiovascular Center Research Institute (H.H., M.K., K.K.), Osaka 565-8565, Japan
5. Institute of Life Science, Kurume University (M.K.), Fukuoka 839-0861, Japan