CJCP     2024 26 (6):  625-630    ISSN: 1008-8830  CN: 43-1301/R Investigation of influencing factors and reference ranges for thyroid function in hospitalized preterm infants at the age of 7 days QI Jiao, HE Xi-Yu Department of Pediatrics, Fifth Medical Center of PLA General Hospital, Beijing 100070, China Received: 2023-12-25  Revised: null  Online: null Supporting info null