Addressing the impact of SARS‐CoV‐2 infection in persons with congenital bleeding disorders: The Italian MECCOVID‐19 study. Issue 4 (13th May 2021) - Coluccia, Antonella; Marchesini, Emanuela; Giuffrida, Anna Chiara; Rivolta, Gianna Franca; Ricca, Irene; Zanon, Ezio; Luciani, Matteo; De Cristofaro, Raimondo; Coppola, Antonio; Rocino, Angiola