Is early combination therapy associated with lower risk of respiratory failure in severely immunocompromised hosts with COVID-19? a target trial emulation study from the omicron-dominant era

Davide Fiore Bavaro; Lucia Diella; Alessandra Belati; Carmen Pellegrino; Giuseppina De Vita; Giuseppe Bruno; Mariacristina Poliseno; Irene Francesca Bottalico; Francesco Rosario Paolo Ieva; Federica De Gregorio; Elisabetta Pallara; Chiara Muscatiello; Francesco Di Gennaro; Linda Bussini; Michele Bartoletti; Giovanni Battista Buccoliero; Sergio Lo Caputo; Annalisa Saracino; Sergio Carbonara