1. Cardiopulmonary Laboratory, Respiratory Therapy Department, Veterans General Hospital‐Taipei, and College of Medicine, National Yang‐Ming University, Taipei, Taiwan, The Republic of China,
2. Department of Medicine, Provincial Tao‐Yuan General Hospital, Tao‐Yuan, Institute of Clinical Medicine, National Yang‐Ming University, Taipei, Taiwan, The Republic of China,
3. Department of Obstetrics and Gynecology, Veterans General Hospital‐Taipei, Taipei, Taiwan, The Republic of China,
4. Department of Biomedical Engineering, Chung‐Yuan Christian University, Chung‐Li, Taiwan, The Republic of China