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Walpoth, Nazan B; Habermacher, Kathrin; Moarof, Igal; Watson, Sandy; Wahl, Andreas; Windecker, Stephan; Schönenberger, Christa; Meier, Bernhard (2008). Device-less patent foramen ovale closure by radiofrequency thermal energy. Swiss medical weekly, 138(7-8), pp. 108-13. Muttenz: EMH Schweizerischer Ärzteverlag
