Improvement of LV functional performance in the chronic total coronary occlusion during the late stage is associated with the extensive collateral development by Robert Normand, Ladouceur-Wodzk Michelle, Munce Nigel R, Qi Xiuling, Liu Garry, Graham John J, Osherov Azriel, Qiang Beiping, Strauss Bradley, Yang Yuesong, Dick Alexander J, Wright Graham A