About the Authors

Yan-yan Li

lyynjmu123@126.com

Affiliation Department of Geriatrics, First Affiliated Hospital of Nanjing Medical University, Nanjing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: Y-yL. Performed the experiments: Y-yL. Analyzed the data: Y-yL. Contributed reagents/materials/analysis tools: Y-yL. Wrote the paper: Y-yL . Y-yL.