Transcatheter closure of large secundum atrial septal defects using the 40 mm Amplatzer septal occluder: results of an international registry. - Lopez,K.; Dalvi,B.V.; Balzer,D.; Bass,J.L.; Momenah,T.; Cao,Q.L.; Hijazzi,Z.M. (Catheter Cardiovasc Interv, 2005)