WANG Chun-lei; KANG Jian; Li Zhen-hua.Department of Geratology; First Affiliated Hospital of China Medical University; Shenyang 110001; China;

• 中国医科大学附属第一医院呼吸研究所;辽宁沈阳;现在中国医科大学附属第一医院老年内科;