For example, if 65 out of 100 patients with a given ICD-code survived the SRR for that code would be 0,65. That would mean 65% of the patients with that ICD code survived. In this study, the SRRs used for ICISS calculations were taken from a publicly available SRR-set calculated from the TITCO dataset (TO BE RELEASED). The ICISS for each patient will then be calculated using two different approaches. The cICISS will be calculated as the product of all of the patient's SRRs. The swiICISS will be equal to the patient's lowest SRR. Both ICISS methods result in a number that ranges from 0 to 1 that should be interpreted as the patient specific probability of survival.