1. Division of Chest Medicine, Department of Internal Medicine, National Cheng Kung University Hospital, Douliu Branch, College of Medicine, National Cheng Kung University, Douliu City 64043, Taiwan
2. Photonics and Information Laboratory, Department of Electrical Engineering, National Yunlin University of Science and Technology, Douliu City 64002, Taiwan
3. Department of Computer Science and Information Engineering, National Yunlin University of Science and Technology, Douliu City 64002, Taiwan