1 Graduate School, Beijing University of Chinese Medicine, Beijing, China; Department of Pediatrics, China-Japan Friendship Hospital, Beijing, China.
2 Center for Evidence-Based Medicine, Capital Institute of Pediatrics, Beijing, China.
3 Department of Pediatrics, China-Japan Friendship Hospital, Beijing, China.
4 Department of Pediatrics, Beijing University of Chinese Medicine Third Affiliated Hospital, Beijing 100029, China. Electronic address: cuixia68@163.com.