1. College of Medicine, Pochon CHA University, CHA Stem Cell Institute 606-16, Yeoksam 1-dong, Kangnam-gu, Seoul 135-081, Republic of Korea, Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea, Mediplex Corp., 1204 ACE High-End Tower, 235-2, Guro-3-dong, Guro-gu, Seoul 152-711, Korea, and Chabiotech Co., Ltd., Yeoksam 1-dong, Kangnam-gu, Seoul 135-081, Republic of Korea