In case you wonder, they are:
4. Inappropriate Processing
5. Unnecessary Inventory
6. Unnecessary Motion
If you are still wondering what this is all about, start with The Goal, a great book on Lean in fiction-style.
... and if you want to know more about Lean specifically for Healthcare, I was suggested to read The Toyota Way to Healthcare Excellence: Increase Efficiency and Quality with Lean, by John Black.
Still in my to-do list... I'm hoping to get to it soon.