1. Department of Anatomy and Histology, School of Basic Medical Sciences Tianjin Medical University Tianjin China
2. Key Laboratory of Hormones and Development (Ministry of Health), Tianjin Key Laboratory of Metabolic Diseases Tianjin Medical University Tianjin China
3. Department of Biomedical Engineering Indiana University‐Purdue University Indianapolis Indianapolis IN USA
4. Tianjin Key Laboratory of Spine and Spinal Cord Tianjin Medical University Tianjin China