Professor Zhi-fei Xu is currently consultant pediatrician of the Respiratory Department and Director of Sleep Center at Beijing Children’s Hospital, National Center for Children’s Health. She is professor of Pediatrics and doctoral supervisor of Capital Medical University. She is President of Pediatric Sleep Association under the Chinese Sleep Research Society, vice President of Pediatric Sleep Group under Chinese Medical Doctor Association and Chair of the specialist training subgroup under the Chinese Pediatric Society. Prof Xu's specialty is pediatric respiratory and sleep medicine.