1. The Institute for Translational NanomedicineShanghai East HospitalThe Institute for Biomedical Engineering & Nano ScienceTongji University School of Medicine Shanghai 200092 P. R. China
2. Department of PathologyWake Forest University School of Medicine Winston‐Salem NC 27157 USA
3. Materials Science and Engineering ProgramDepartment of Mechanical and Materials EngineeringCollege of Engineering and Applied ScienceUniversity of Cincinnati Cincinnati OH 45221 USA