About the Authors

Qian Cai

Affiliations Department of Pediatrics, University of Kentucky College of Medicine, Lexington, Kentucky, United States of America, Department of Geriatrics, Qi-Lu Hospital of Shandong University, Jinan, Shandong, P. R. China

Ling Guo

Affiliation Department of Pediatrics, University of Kentucky College of Medicine, Lexington, Kentucky, United States of America

Haiqing Gao

Affiliation Department of Geriatrics, Qi-Lu Hospital of Shandong University, Jinan, Shandong, P. R. China

Xiang-An Li

xli2@email.uky.edu

Affiliation Department of Pediatrics, University of Kentucky College of Medicine, Lexington, Kentucky, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HG X-AL. Performed the experiments: QC LG. Analyzed the data: QC. Wrote the paper: QC X-AL.