The collection and use of all human pathological specimens for the research were approved by the Ethical Committee of Northwest University (Xi'an, China), the Ethical Committee of Second Affiliated Hospital of Xi'an Jiaotong University (Xi'an, China), and the Ethical Committee of Tangdu Hospital of Fourth Military Medical University (Xi'an, China). Written informed consent was received from participants for the collection of their whole serum. This study was conducted in accordance with the ethical guidelines of the Declaration of Helsinki.
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