Interleukin‐6 added to CALL score better predicts the prognosis of COVID‐19 patients. Issue 1 (18th December 2020) - Grifoni, Elisa; Vannucchi, Vieri; Valoriani, Alice; Cei, Francesco; Lamanna, Roberta; Gelli, Anna Maria Grazia; Ciambotti, Benedetta; Moroni, Federico; Pelagatti, Lorenzo; Tarquini, Roberto; Landini, Giancarlo; Vanni, Simone; et al.