CJCP     2023 25 (6):  612-618    ISSN: 1008-8830  CN: 43-1301/R Application of a low copper diet guidance based on food exchange portions in children with hepatolenticular degeneration CHEN Ying-Xiang, QIU Zheng-Qing, SUN Jing, LI Yang, YANG Ying School of Nursing, Peking Union Medical College, Beijing 100144, China Received: 2022-12-08  Revised: null  Online: null Supporting info