Realization of a part of clinical trial called A Randomized, Double-blind, Parallel Group, Multicentre Phase IIIb Study to Compare Ticagrelor With Clopidogrel Treatment on the Risk of Cardiovascular Death, Myocardial Infarction and Ischemic Stroke in Patients With Established Peripheral Artery Disease (EUCLID Examining Use of tiCagreLor In paD)