Fabbri, Nicolò, et al. “Risks of COVID-19 Transmission in Blood and Serum During Surgery. A Prospective Cross-Sectional Study from a Single Dedicated COVID-19 Center”. Annali Italiani Di Chirurgia, vol. 91, no. 3, May 2020, pp. 235-8, https://annaliitalianidichirurgia.it/index.php/aic/article/view/1689.