Clinical features of hereditary angioedema and warning signs (H4AE) for its identification Pedro Giavina-Bianchi; Marcelo Vivolo Aun; Juliana Fóes Bianchini Garcia; Laís Souza Gomes; Ana Júlia Ribeiro; Priscila Takejima; Rosana Câmara Agondi; Jorge Kalil; Antonio Abilio Motta;