1 Department of Respiration, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China.
2 Department of Orthopedics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
3 Department of Central Laboratory, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
4 Department of Respiration, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China. Electronic address: [email protected].