Department of Bacteriology, Capital Institute of Pediatrics, Beijing100020, China;
Department of Bacteriology, Capital Institute of Pediatrics, Beijing100020, China;
Department of Bacteriology, Capital Institute of Pediatrics, Beijing100020, China;
Affiliated Children's Hospital of Capital Institute of Pediatrics,Beijing 100020, China;
Affiliated Children's Hospital of Capital Institute of Pediatrics,Beijing 100020, China;
Department of Bacteriology, Capital Institute of Pediatrics, Beijing100020, China;
Department of Bacteriology, Capital Institute of Pediatrics, Beijing100020, China;