1. Department of General Dentistry, Keelung Chang Gung Memorial Hospital, Keelung City 204201, Taiwan
2. Department of General Dentistry, Chang Gung Memorial Hospital, Taoyuan City 33305, Taiwan
3. Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan City 32023, Taiwan
4. School of Physical Educational College, Jiaying University, Meizhou 514000, China
5. Department of Electrical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan
6. Department of Information Management, Chung Yuan Christian University, Taoyuan City 320317, Taiwan
7. Ateneo Laboratory for Intelligent Visual Environments, Department of Information Systems and Computer Science, Ateneo de Manila University, Quezon City 1108, Philippines