1. Clinic of Phlebology, 02-034 Warsaw, Poland
2. Department of General, Endocrinological and Vascular Surgery, Central University Hospital, Medical University of Warsaw, 02-091 Warsaw, Poland
3. Department of Congenital Heart Diseases, National Institute of Cardiology, 04-628 Warsaw, Poland
4. Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
5. Center of Postgraduate Medical Education, 01-813 Warsaw, Poland
6. Center of Biostructure Research, Medical University of Warsaw, 02-004 Warsaw, Poland