1. College of Dental Medicine; Kaohsiung Medical University; Department of Dentistry; Kaohsiung Medical University Hospital; Kaohsiung 807 Taiwan
2. Department of Fiber and Composite Materials; Feng Chia University; Taichung 407 Taiwan
3. College of Medicine; Kaohsiung Medical University; Department of Orthopaedics; Kaohsiung Medical University Hospital; Kaohsiung 807 Taiwan