1. Department of OrthopedicsShanghai General HospitalShanghai Jiaotong University School of Medicine Shanghai 200080 China
2. State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low‐Dimension MaterialsDonghua University Shanghai 201620 China
3. State Key Laboratory of Molecular Engineering of PolymersDepartment of Macromolecular Science and Laboratory for Advanced MaterialsFudan University Shanghai 200433 China