Leader, Joshua H Leal, Margarida, Cardiology Department - Hospital Distrital de Santarém Lebeau, Jean‑Pierre Lecelrc, Guy, AccelLAB Inc., Boisbriand, Quebec, Canada Lech, Agnieszka Lech, Agnieszka, Department of Congenital Heart Diseases, Institute of Cardiology, Warsaw, Poland Lech, Agnieszka K., Department of Congenital Heart Disease, Institute of Cardiology, Warsaw-Anin, Poland Lech, Agnieszka Lech, Bogdan Lech, Gustaw Lech, Piotr Lechowicz-Wilińska, Marta Leclerc, Guy Leclercq, Christophe Ledakowicz-Polak, Anna Lee, Byoung Kwon, Division of Cardiology, Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea Lee, Ching-Wei Lee, Christopher, Mitralign Inc, Tewksbury, MA, USA Lee, Edward CY Lee, Geraldine A Lee, Jae Koo Lee, James Lee, Jeesoo Lee, Jin Lee, Joshua SW