1. Department of Thoracic Surgery, ‘Marius Nasta’ National Institute of Pneumology, 050152 Bucharest, Romania
2. Department of Urology, ‘Prof. Dr. Th. Burghele’ Clinical Hospital, 061344 Bucharest, Romania
3. Department of General Surgery, ‘Sf. Ioan’ Clinical Emergency Hospital, 042122 Bucharest, Romania
4. Department of Pneumology, ‘Marius Nasta’ National Institute of Pneumology, 050152 Bucharest, Romania