Cavalli, L., L. Angehrn, C. Schindler, N. Orsini, C. Grob, M. Kaufmann, L. A. Steiner, M. Schwenkglenks, and S. Dell-Kuster. “Number of Comorbidities and Their Impact on Perioperative Outcome and Costs – a Single Centre Cohort Study”. Swiss Medical Weekly, vol. 152, no. 1112, Mar. 2022, p. w30135, doi:10.4414/SMW.2022.w30135.