Kourelis, Georgios;
Kanakis, Meletios;
Loukas, Constantinos;
Kakava, Felicia;
Kyriakoulis, Konstantinos;
Bobos, Dimitrios;
Apostolopoulou, Sotiria;
Rammos, Spyridon;
Giannopoulos, Nikolaos:
Efficiency and Safety of Patent Ductus Arteriosus Surgical Ligation in Extremely Low Birth Weight Infants Without Chest Tube Placement