Assessing the importance of interleukin-6 in COVID-19 – Authors' reply. Issue 2 (February 2021) - Leisman, Daniel E; Ronner, Lukas; Pinotti, Rachel; Taylor, Matthew D; Sinha, Pratik; Calfee, Carolyn S; Hirayama, Alexandre V; Mastroianni, Fiore; Turtle, Cameron J; Harhay, Michael O; Legrand, Matthieu; Deutschman, Clifford S