Links
[1] http://www.kinderkardiologie-bonn.de/
[2] https://spb-cts.freelock.com/user/login?destination=user/454544
[3] https://spb-cts.freelock.com/print/home/breuer
[4] https://spb-cts.freelock.com/article/hybrid-procedure-vsd-closure
[5] https://spb-cts.freelock.com/articles/Breuer
[6] https://spb-cts.freelock.com/society/ctsnet