CJCP     2022 24 (2):  147-154    ISSN: 1008-8830  CN: 43-1301/R Association of the levels of heavy metals and trace elements during pregnancy with congenital heart defects in offspring: a prospective cohort study LIU Jing-Ting, ZHOU Ya-Wei, WANG Wen-Di, MAO Bao-Hong, HU Ya-Guang Maternal and Child Health Care Research Center, Gansu Provincial Maternity and Child Care Hospital, Lanzhou 730050, China Received: 2021-09-10  Revised: null  Online: null Supporting info