Figure 1.

Diagram depicting creation of evaluation and model training data sets. Patients were randomly assigned to either the evaluation data set or the model training data set. Patients in the model training data set were then further randomly sampled to create additional subsampled data sets of 200, 100, or 50 patients. Sampling was performed such that each patient was included in each subsampled data set no more than once, but such that one patient could be included in more than one of the subsampled data sets.