Derivation and performance of an end-of-life practice score aimed at interpreting worldwide treatment-limiting decisions in the critically ill oleh Spyros D. Mentzelopoulos, Su Chen, Joseph L. Nates, Jacqueline M. Kruser, Christiane Hartog, Andrej Michalsen, Nikolaos Efstathiou, Gavin M. Joynt, Suzana Lobo, Alexander Avidan, Charles L. Sprung, the End-of-life Practice Score Study Group