1. Institute of Laboratory Medicine, Guangdong Medical University, Dongguan, Guangdong 523808, P.R. China
2. Department of Respiration, Dongguan 6th Hospital, Dongguan, Guangdong 523000, P.R. China
3. Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Dongguan, Guangdong 523808, P.R. China