Patti, Giuseppe, Ludmilla Mantione, Edoardo Bressi, and Antonio Bisignani. 2018. “Efficacy and Safety of Oral Anticoagulant Therapy in Frail Patients With Atrial Fibrillation”. Monaldi Archives for Chest Disease 88 (2). https://doi.org/10.4081/monaldi.2018.958.