Wolfisberg, S., Gregoriano, C., Struja, T., Kutz, A., Koch, D., Bernasconi, L., Hammerer-Lercher, A., Mohr, C., Haubitz, S., Conen, A., Fux, C. A., Mueller, B. and Schuetz, P. (2021) “Comparison of characteristics, predictors and outcomes between the first and second COVID-19 waves in a tertiary care centre in Switzerland: an observational analysis”, Swiss Medical Weekly, 151(3132), p. w20569. doi: 10.4414/smw.2021.20569.