About the Authors

Xin-Nan Zong, Hui Li
Department of Growth and Development, Capital Institute of Pediatrics, Beijing, China

Corresponding Author

huiligrowth@163.com

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HL. Analyzed the data: XNZ. Wrote the paper: XNZ HL.