So it looks like I am about to finish my observership at Cincinnati Children’s Hospital Medical Center. That was undoubtedly very important time for my surgical training and probably for my future research field. The motto of CCHMC is “Change the outcome” and in my opinion they really put a lot of effort to fulfill that. Great thanks to dr Jose Peiro and all team members – for being so open and sharing your knowledge with me! I also wanted to thank to my boss, prof. Dariusz Patkowski who inspired me and force me to take this chance and once again thanks to Fundacja Uniwersytetu Medycznego we Wrocławiu which made it possible!