1 Department of Internal Medicine, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan.
2 Division of Pulmonary Medicine, Department of Internal Medicine, Sinwu Branch, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan.
3 Department of Internal Medicine, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan. Electronic address: chestman9@gamil.com.