Influence of <i>PCDH9</i> (rs9540720) and narcissistic personality traits on the incidence of major depressive disorder in Chinese first-year university students: findings from a 2-year cohort study.

"data are freely available for download at https://figshare com/ . data availability statement the original contributions presented in the study are publicly available. these data can be found at: https://figshare"

"Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest."

"The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This study was funded by the Taishan Scholar’s Program of Shandong Province (grant number: tsqn201909145), the National Natural Science Foundation (grant number: 81901391), the Natural Science Foundation of Shandong Province (grant number: ZR2019MH095), the High-level Scientific Research Project Cultivation Program of Jining Medical University (grant number: JYGC2022KJ008), the Key Research Planning Project of Jining City (grant numbers: 2023YXNS102 and 2023YXNS213), and the Shandong Social Science Planning Fund Program (grant number: 22CJYJ04). The National Human Genetic Resources Sharing Service Platform (grant number: 2005DKA21300) provided technical support and DNA storage services. All funders had no role in the design and conduction of this study."