A procedure to identify persistent and effort‐independent individual differences in preference for heroin over rewarding social interaction. - D'Ottavio, Ginevra; Sullivan, Alana; Pezza, Sara; Ruano, Maria Chiara; Modoni, Jacopo; Reverte, Ingrid; Marchetti, Claudia; Zenoni, Soami F.; Venniro, Marco; Milella, Michele S.; Boix, Fernando; Shaham, Yavin; et al. (British Journal of Pharmacology, 2025)