IL6 and COVID-19: We found that IL-6, myoglobin and cardiac troponin were not measured on a daily basis around ICU admission both in our cohort (38.2, 59.7, 62.7% respectively) and in the international RISC-19-ICU registry cohort of critically ill COVID-19 patients (14.6, 9.6, 30.0% in Switzerland and 15.3, 6.7, 28.2% internationally), thereby making them poor candidates for longitudinal data alignment (Figure 1C).