Ethics Approval

WS Wenyan Sun
XZ Xuetong Zhao
ND Nicola Dalbeth
RT Robert Terkeltaub
LC Lingling Cui
ZL Zhen Liu
LH Lin Han
CW Can Wang
HZ Hui Zhang
YB Yiming Bao
CL Changgui Li
JL Jie Lu
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The protocol of this study was approved by the Ethics Committee of the Affiliated Hospital of Qingdao University and conducted in accordance with the Declaration of Helsinki. All participants provided written informed consent. The scientific committees of the four cohorts approved the use of the data for this study.

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