Address correspondence to: Mei-Chen Yang, MD, Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Tzu-Chi Hospital, Buddhist Tzu-Chi Medical Foundation, 289 Jianguo Rd., Xindian Dist., New Taipei City 23143, Taiwan; Tel: +886-2-6628-9779 #5709; Fax: +886-2-6628-9009; Email:

E-mail Address: [email protected]

Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei, Taiwan

School of Medicine, Tzu Chi University, Hualien, Taiwan