Security and Usability of a Personalized User Authentication Paradigm: Insights from a Longitudinal Study with Three Healthcare Organizations. - Argyris Constantinides; Marios Belk; Christos Fidas; Roy Beumers; David Vidal; Wanting Huang; Juliana Bowles; Thais Webber; Agastya Silvina; Andreas Pitsillides (ACM Trans. Comput. Heal., 2023)