1. Department of Anatomy, Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering; Southern Medical University; Guangdong Guangzhou 510515 P. R. China
2. Department of Mechanical Engineering; Faculty of Engineering; Department of Biochemistry & Biomedical Genetics; Faculty of Medicine; University of Manitoba; Winnipeg Manitoba R3T 2N2 Canada
3. Children's Hospital Research Institute of Manitoba, Winnipeg; Manitoba R3T 2N2 Canada
4. Department of Biosystem Engineering; Faculty of Engineering; University of Manitoba; Winnipeg Manitoba R3T 2N2 Canada