[Getty Images]Matthias Jaissle points to his neck."I had a tumour when I was five years old," the Newcastle United head coach says. "Here in my neck so I couldn't move it anymore."That was a period where I already learned a lot about life, how important it is to be healthy, and how grateful you can be to be healthy and to follow your dream."It was not clear that I could play football as a kid anymore."He did not elaborate further, but such perspective would be needed.Jaissle, like so many, visua