1. School of Nursing, China Medical University, Taichung 40402, Taiwan
2. Department of Nursing, China Medical University Hospital, Taichung, Taiwan
3. School of Nursing, Chung Shan Medical University, Taichung, Taiwan
4. School of Nursing, National Defense Medical Center, Taipei, Taiwan
5. Department of Respiratory Therapy, China Medical University, Taichung 40402, Taiwan
6. Sleep Medicine Center and Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan
7. School of Chinese Medicine, China Medical University, No. 91 Hsueh-Shih Road, Taichung 40402, Taiwan