| AIC | Akaike’s Information Crite-rion; |
| COVID-19 | coronavirus disease 2019; |
| FP | false positive; |
| FPG | Fondazione Policlinico Universitario Agostino Gemelli IRCCS; |
| IgA | immunoglobulin A; |
| FLC | free light chains; |
| IQR | interquartile ranges; |
| SARS-CoV-2 | severe acute respiratory syndrome coronavirus 2; |
| TP | true positive. |
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