First-episode psychosis patients who deteriorated in the premorbid period do not have higher polygenic risk scores than others: a cluster analysis of EU-GEI data - Ferraro, Laura; Quattrone, Diego; Barbera, Daniele La; Cascia, Caterina La; Morgan, Craig; Kirkbride, James B; Cardno, Alastair G; Sham, Pak; Tripoli, Giada; Menezes, Paulo Rossi (Schizophrenia bulletin, 2023)