I found this book: Lean in Hospitals by Mark Graban. I have not read it yet, but the idea is very interesting.
I still believe that the focus on lean is the wrong direction. In “The Toyota Way” by Jeffrey Liker the principles behind the Toyota Production System are described. Liker mentions in his last chapter that ideas like Lean, Six Sigma, Lean Management, and the Theory of Constraints are only short-cuts that will not work in an environment that does not emphase the values and principles of the Toyota Production System.
When I read the book 2004 the first time I was so fascinated that I wrote a mapping between the 14 Principles and Scrum. I still believe the mapping is valid. If you want to read it – have a look: Scrum Delivers.