1. Department of Bacteriology, Capital Institute of Pediatrics, Beijing, China
2. Children’s Hospital Capital Institute of Pediatrics, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
3. Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an, Shaanxi, China
4. Beijing Municipal Key Laboratory of Child Development and Nutriomics, Capital Institute of Pediatrics, Beijing, China
5. Center for Infectious Diseases, the Fifth Medical Center of Chinese PLA General Hospital, Beijing, China