2.6. Ethics approval and informed consent
BLOOD
The ethics committee of Guangdong Cord Blood Bank approved this study (No. IRB-2022004). All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised most recently in 2013. All participants had provided their written informed consent to this study. The study data did not involve information that could identify individual participants.