Hellmann, Marcin, Department of Noninvasive Cardiac Diagnostics Medical University of Gdansk Hellmann, Marcin, Zakład Diagnostyki Chorób Serca, II Katedra Kardiologii, Gdański Uniwersytet Medyczny Hellmann, Marcin Hellmann, Marcin Helmy, Mohamed Helvacı, Aysen, Department of Cardiology, Okmeydanı Training and Research Hospital, Istanbul Hendiger, Włodzimierz, Vascular Surgery and Angiology Clinic, Medical Centre of Postgraduate Education Hendriks, Jeroen Hendzel, Piotr Hendzel, Piotr (Poland) Hendzel, Piotr Henke, Christiane, University of Technology Dresden, Heart Center University Hospital Dresden, Germany Henry, Brandon M Henschke, Jacek Henzel, Jan Henzel, Jan Heper, Yasemin Herbaczyńska-Cedro, Krystyna Herczyński, Daniel Herdyńska-Wąs, Mirosława Herdyńska-Wąs, Mirosława M Heredia, Jeronimo Daniel, Department of Congenital Heart Diseases and Paediatric Cardiology, Silesian Centre for Heart Diseases, Zabrze, Poland Heresi, Gustavo A Heretyk, Hanna Hering, Dagmara