Correction to: Opioid analgesic dose and route conversion ratio studies: a scoping review to inform an eDelphi guideline

Davis, Mellar P; Davies, Andrew; Mcpherson, Mary Lynn; Reddy, Akhila; Paice, Judith A; Roeland, Eric; Walsh, Declan; Mercadante, Sebastiano; Case, Amy; Arnold, Robert; Satomi, Eriko; Crawford, Gregory; Bruera, Eduardo; Ripamonti, Carla