"....Despite the seeming abstractness at the beginning, at the end of the book, the author comes to very concrete conclusions. The book has been written by a practicing doctor who advocates that there is nothing more practical than a good theory. Thus, from his point of view, a good theory must end with concrete practical recommendations: How to diagnose on time, how and by which means to treat, how to monitor the treatment process… This book has been written for curious people ready to make certain sacrifices to satisfy their curiousness, to sacrifice their time and intellectual efforts. Moreover, a philosophical mindset is also helpful for the reader. If you, dear reader, are ready for this, let us begin...."