Silman, A.J. et al. 2021. International variation in distribution of ASA class in patients undergoing total hip arthroplasty and its influence on mortality: data from an international consortium of arthroplasty registries. Acta Orthopaedica. 92, 3 (Mar. 2021), 304–310. DOI:https://doi.org/10.1080/17453674.2021.1892267.