Serum cytokine pattern in children with hemophagocytic lymphohistiocytosis.

"Declarations Ethical approval and consent to participateThis study was conducted in accordance with the Declaration of Helsinki and approved by the Institutional Review Board (IRB) of Beijing Children’s Hospital, Capital Medical University. Consent for publicationAll authors have read and approved the final manuscript. All parents signed informed consent forms and approved the final manuscript. Conflicts of interestThe authors declare no competing interests. Conflicts of interest The authors declare no competing interests."

"We thank all the patients and their families for their kind cooperation. We thank all the members of the clinical team who provided care for patients. This work was supported by the National Natural Science Foundation of China (No.82070202), the Beijing Municipal Science & Technology Commission (No. 7214226), the Special Fund of the Pediatric Medical Coordinated Development Center of Beijing Hospitals Authority (No. XTZD20180202), National Science and Technology Key Projects (No. 2017ZX09304029001), and Funding for Reform and Development of Beijing Municipal Health Commission."