Application effect of graded psychological nursing intervention system in improving anxiety and depression in hospitalized children and adolescents 
Peng Hong, Tao Li, Gu Jing, He Juan, Tang Mei
International Medicine and Health Guidance News . 2022, (6): 773 -776 .  DOI: 10.3760/cma.j.issn.1007-1245.2022.06.10