Department of Pulmonary Medicine Qinhuangdao Traditional Chinese Medicine Hospital Qinhuangdao 066000 Hebei China;
Department of Pulmonary Medicine Qinhuangdao Traditional Chinese Medicine Hospital Qinhuangdao 066000 Hebei China;
Department of Pulmonary Medicine Qinhuangdao Traditional Chinese Medicine Hospital Qinhuangdao 066000 Hebei China;
Department of Pulmonary Medicine Qinhuangdao Traditional Chinese Medicine Hospital Qinhuangdao 066000 Hebei China;