An individualized decision aid for physicians and patients for total knee replacement in osteoarthritis (Value-based TKR study): study protocol for a multi-center, stepped wedge, c... oleh Toni Lange, Stefanie Deckert, Franziska Beyer, Waldemar Hahn, Natascha Einhart, Martin Roessler, Martin Sedlmayr, Jochen Schmitt, Jörg Lützner