Chapter “Urgent surgery early after percutaneous coronary intervention in a patient with atrial fibrillation on triple therapy of non-vitamin K antagonist oral anticoagulant, aspirin and clopidogrel” for the book “Atrial fibrillation and percutaneous coronary intervention – A case-based guide to oral anticoagulation, antiplatelet therapy and stenting” (Editors A. Rubboli, G.Y.H. Lip) (Springer)