About the Authors

Yafeng Song

Affiliation Department of Integrative Medical Biology, Section for Anatomy, Umeå University, Umeå, Sweden

Sture Forsgren

Affiliation Department of Integrative Medical Biology, Section for Anatomy, Umeå University, Umeå, Sweden

Jing-Xia Liu

Affiliation Department of Integrative Medical Biology, Section for Anatomy, Umeå University, Umeå, Sweden

Ji-Guo Yu

Affiliation Department of Surgical and Perioperative Sciences, Sports Medicine Unit, Umeå University, Umeå, Sweden

Per Stål

per.stal@anatomy.umu.se

Affiliation Department of Integrative Medical Biology, Section for Anatomy, Umeå University, Umeå, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YS SF PS. Performed the experiments: YS SF PS. Analyzed the data: YS SF JL JY PS. Contributed reagents/materials/analysis tools: SF PS. Wrote the paper: YS SF JL JY PS.