Ketamine to enhance methadone treatment retention in patients with opioid use disorder and co-morbid depression. - Manza P; Belcher AM; Fitzsimons H; Spaderna M; Greenblatt AD; Smith HC; Derenoncourt M; Gann D; Farooq U; Kvarta MD; DiPaula BA; Merritt S; et al. (The American journal of drug and alcohol abuse, 2025)