Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Health Center, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;
Department of Respiratory Medicine, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010059, China;