PROS1 and atrial fibrillation: Our findings demonstrated thatthe incidence of atrial fibrillation (AF) among COVID-19 patients was 10%, which is in line with previous study (Cangemi et al., 2015), suggesting that SARS-Cov2 virus also attacks hearts, in addition to the respiratory system during COVID-19 development, possibly through interaction with the S protein on target cells.