⁎Address all correspondence to: Yong Hyun Jeon, PhD, Leading-edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, 807 Hogukro, Bukgu, Daegu 702-210, South Korea, or Jaetae Lee, MD, PhD, Department of Nuclear Medicine, Kyungpook National University Hospital, 50 Samduk 2-ga, Daegu 700-721, South Korea.Yong Hyun Jeon, PhD, Leading-edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease, Kyungpook National University Hospital, 807 Hogukro, Bukgu, Daegu 702-210, South Korea, or Jaetae Lee, MD, PhD, Department of Nuclear Medicine, Kyungpook National University Hospital50 Samduk 2-gaDaegu700-721South Korea jeon9014@gmail.com