Fig. 1

Swimmer plot representing individual trajectories and successive UHAs from initial hospital discharge to death or last follow-up

Each horizontal bar represents an individual trajectory from initial hospital discharge to death or last follow-up. The dots symbolize the repeated UHAs. We have sorted the observations by the overall survival duration. Only the first 12 months of follow-up are represented on this figure; further follow-up and UHAs occurring beyond 12 months are not represented for the 6 patients alive for more than 12 months (observations censored at 12 months)