1. Medical University of Silesia, Katowice, Poland
2. H-T. Medical Center-ENDOTERAPIA, Tychy, Poland
3. Higher Technical School in Katowice, Katowice, Poland
4. Maria Skłodowska-Curie Institute of Oncology, Warszawa, Poland
5. Hospital of Ministry of Interior, Szczecin, Poland
6. Medical Center Sonomed, Szczecin, Poland
7. Medical University of Białystok, Białystok, Poland
8. Centrum Medyczne Sonomed, Szczecin, Poland
9. University of Oslo, Oslo, Norway
10. The University Of Kansas Medical Center, Kansas City, United States of America