In reply to: "Phosphate additives in food : a health risk by Prof. Dr. med. Eberhard Ritz, Dr. med. Kai Hahn, Prof. Dr. med. Markus Ketteler, Prof. Dr. med. Martin K. Kuhlmann, Prof. Dr. med. Johannes Mann in volume 4/2012" - Ritz, Eberhard (Deutsches Ärzteblatt, 2012)