Contemporary medicine is developing and evolving constantly. Various teams and authors research and write by utilizing the former studies. Each study carries the flag further. In this context, we are pleased to offer our contribution to our colleagues all around the world who do their best day and night. This book is the fruit of the long and challenging studies of its authors. It contains 16 topics which all highlight significant contemporary medical issues and provide insight. I kindly advise reading them and I am sure they will be quite helpful in both practical medicine and for the future studies of our colleagues.