Mechanism of Drug-Eluting Stent Thrombosis Diagnosed by Histopathological Evaluation of Directional Coronary Atherectomy Specimen oleh Kazuki Ito, MD, Shinya Fujita, MD, Atsushi Sakamoto, MD, PhD, Hayato Ohtani, MD, PhD, Masahiro Muto, MD, Yuichiro Maekawa, MD, PhD