A national survey on prevalence of possible echocardiographic red flags of amyloid cardiomyopathy in consecutive patients undergoing routine echocardiography: study design and patients characterization — the first insight from the AC-TIVE Study. (9th September 2021) - Merlo, Marco; Porcari, Aldostefano; Pagura, Linda; Cameli, Matteo; Vergaro, Giuseppe; Musumeci, Beatrice; Biagini, Elena; Canepa, Marco; Crotti, Lia; Imazio, Massimo; Forleo, Cinzia; Cappelli, Francesco; et al.