Silman, A.J., Combescure, C., Ferguson, R.J., Graves, S.E., Paxton, E.W., Frampton, C., Furnes, O., Fenstad , A.M. , Hooper, G., Garland, A., Spooren, A.S.-., Wilkinson, J.M., Mäkelä, K., Lübbeke, A. and 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 (Mar. 2021), 304–310. DOI:https://doi.org/10.1080/17453674.2021.1892267.