Heart rate variability in newborn foals and its association with illness : a pilot study - Vitale, Valentina (University of Pisa. Ospedale Didattico Veterinario "Mario Modenato".) ; Conte, Giuseppe (University of Pisa. Department of Agriculture, Food and Environment) ; Baragli, Paolo (University of Pisa. Dipartimento Scienze Veterinarie) ; José Cunilleras, Eduard (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals) ; Sgorbini, Micaela (University of Pisa. Ospedale Didattico Veterinario "Mario Modenato")