Anesthesia Department Guangxi minzu Hospital Nanning 53001 China;
Digestive System Department Guangxi minzu Hospital Nanning 53001 China;
Digestive System Department Guangxi minzu Hospital Nanning 53001 China;
Digestive System Department Guangxi minzu Hospital Nanning 53001 China;
Painless gastroenteroscopy; Dexmedetomidine; Propofol; Etomidate; Children;