Impaired platelet responses to clopidogrel and ticlopidine in a patient with recurrent coronary stent stenosis - Obergfell, Achim; Strotmann, Jörg; Bonz, Andreas; Bauersachs, Johann; Ertl, Georg; Walter, Ulrich; Grossmann, Ralf (Thrombosis and Haemostasis, 2004)