Silman, A. J., Combescure, C., Ferguson, R. J., Graves, S. E., Paxton, E. W., Frampton, C., … Rolfson, O. (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), 304–310. https://doi.org/10.1080/17453674.2021.1892267