Percutaneous closure of the patent foramen ovale using the HELEX® Septal Occluder: acute and long-term results in 405 patients

Corinna Heinisch, MD; Stefan Bertog, MD; Nina Wunderlich, MD; Nico Majunke, MD; Andreas Baranowski, MD; Michaela Leetz, MD; Evelyne Fischer, MD; Stefan Staubach, MD; Wibke Zimmermann, MD; Ilona Hofmann, MD; Horst Sievert*, MD