Chronic hypobaric hypoxia, patent arterial duct and a new interventional technique to close it

1. Freudenthal, F.P.
2. Heath, A.
3. Villanueva, J.
4. Mendes, J.
5. Vicente, X.
6. Von Alvensleben, I.
7. Echazú, G.
8. Navarro, J.
9. Lang, N.
10. Kozlik-Feldmann, R.