Acknowledgments
We thank the study coordinators Hye Young Lim, Nam Hee Kim, Mi
Joung Moon, Hwa Young Lee, Mi Joung Kwon, Su Yeon An, Su Joung
Oh and Hye Young Kwak for contribution to this study.
Author Contributions
Conceived and designed the experiments: YKK CWY. Performed the
experiments: HWK SHK YKK YOK DCJ HCS EJC. Analyzed the data:
HWK YKK CWY. Contributed reagents/materials/analysis tools: SHK
YKK YOK DCJ YLK YSK SWK NHK CWY. Wrote the paper: HWK
YKK.