Mortality Prediction Performance Under Geographical, Temporal, and COVID-19 Pandemic Dataset Shift: External Validation of the Global Open-Source Severity of Illness Score Model by Takeshi Tohyama, MD, PhD, Liam G. McCoy, MD, MSc, Euma Ishii, MD, PhD, Sahil Sood, Jesse Raffa, PhD, Takahiro Kinoshita, MD, MPH, Leo Anthony Celi, MD, MPH, MSc, Satoru Hashimoto, MD, PhD

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