1Department of Biomedical Engineering, National Taiwan University, No. 1, Sec. 1, Jen-Ai Road, Taipei City 10051, Taiwan
2Department of Orthopaedic Surgery, National Taiwan University Hospital, No. 7, Chung Shan South Road, Taipei City 10002, Taiwan
3Integrative Stem Cell Center, China Medical University, No. 2, Yude Road, Taichung City 40447, Taiwan
*Authors to whom correspondence should be addressed.