1. Department of Microbiology and Parasitology, College of Basic Medical Science, China Medical University, Shenyang, People’s Republic of China
2. Department of Respiratory Medicine, General Hospital of Shenyang Military Command, Shenyang, People’s Republic of China
3. Department of Respiratory Internal Medicine, First Affiliated Hospital of China Medical University, Shenyang, People’s Republic of China
4. Department of Clinical Laboratory, Eleventh Affiliated Hospital of Shanxi Medical University, Shanxi, People’s Republic of China
5. Critical Care Medicine Department, NIH Clinical Center, Bethesda, Maryland, USA