TY - RPRT TI - Externalizing Polygenic Liability, Brain Imaging Phenotypes, and Adolescent Substance Use Initiations: A Multistage Association and Mediation Analysis in ABCD AU - Wei, M. AU - Peng, Q. PY - 2026 DO - 10.64898/2026.04.08.717299 UR - https://www.biorxiv.org/content/10.64898/2026.04.08.717299v1 ID - 10.64898/2026.04.08.717299 ER -