Te-Chih Hsiung1, Chih-Hsi Kuo2, Han-Pin Kuo3. 1. Department of Thoracic Medicine, St. Paul's Hospital, Taoyuan, Taiwan. 2. Department of Thoracic Medicine, St. Paul's Hospital, Taoyuan, Taiwan; Department of Thoracic Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan. Electronic address: chihhsikuo@gmail.com. 3. Department of Thoracic Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan. Electronic address: q8828@ms11.hineit.net.