Erratum to: Mortality prediction after cardiac surgery: blood lactate is indispensible. Thorac Cardiovasc Surg 2012 (epub ahead of print) - Badreldin, Akmal M. A.; Brehm, Bernhard R.; Elsobky, Sherif; Abul-dahab, Mohamed; Lehmann, Thomas; Bayer, Ole; Wahlers, Thorsten; Hekmat, Khosro (The Thoracic and Cardiovascular Surgeon, 2013)