Hałas, Katarzyna, Department of Cardiology and Internal Diseases, Military Institute of Medicine, Warsaw, Poland Hałgas, Kacper He, Chengyu He, Jixian, Department of Cardiovasology, the Central Hospital of Guangyuan, Guangyuan, Sichuan, P.R.China, 628000. He, Wenfeng, Department of Cardiology, Affiliated Hospital of North Sichuan Medical College He, Ye He, Yuanjun, Department of Cardiovasology, the Central Hospital of Guangyuan, Guangyuan, Sichuan, P.R.China, 628000. Head, Stuart J. Head, Stuart J. (The Netherlands) Heba, Grzegorz Heba, Grzegorz Heciak, Jacek Hedayat, Daryoosh Kamal Hedley, Paula L. Heidbuchel, Hein Heidbuchel, Hein Heidrich, Felix M., Heart Center Dresden at Technische Universität Dresden Dept. of Cardiology Fetscherstr. 76 01307 Dresden GERMANY Heinze-Paluchowska, Sylwia, Instytut Fizyki Jądrowej Polskiej Akademii Nauk Heinze-Paluchowska, Sylwia Hejna, Petr, Department of Forensic Medicine, Faculty of Medicine, Charles University and University Hospital, Hradec Kralove, Czech Republic Heleniak, Anna, Medical University of Warsaw Heleniak, Zbigniew Hellevik, Leif Rune Hellmann, Andrzej R., Department of General, Endocrine and Transplant Surgery, Medical University of Gdansk, Gdansk, Poland Hellmann, Marcin, Department of Noninvasive Cardiac Diagnostics Medical University of Gdansk