Comparative efficacy of intrathecal morphine and adductor canal block in the knee arthroplasty population: a retrospective multi-centre cohort study. - Brown, Brigid; Cheok, Tim Soon; Worsley, David; Kroon, Hidde M.; Davis, Nathan; Jaarsma, Ruurd L.; Doornberg, Job; Lin, D-Yin (BMC Anesthesiology, 2024)