Economic impact and disease burden of COVID-19 in a tertiary care hospital: A three-year analysis - Mari Kanerva; Kalle Rautava; Tiina Kurvinen; Harri Marttila; Taru Finnilä; Kaisu Rantakokko-Jalava; Mikko Pietilä; Pirjo Mustonen; Mika Kortelainen (PLoS ONE, 2025)