"Hey assistant, how can I become a donor?" The case of a conversational agent designed to engage people in blood donation. - Mateus Klein Roman; Ericles Andrei Bellei; Daiana Biduski; Adriano Pasqualotti; Cristiane Da Silva Rodrigues De Araujo; Ana Carolina Bertoletti De Marchi (J. Biomed. Informatics, 2020)