Lifestyle Intervention in Chronic Ischaemic Heart Disease and Type 2 Diabetes (the LeIKD study): study protocol of a prospective, multicentre, randomised, controlled trial oleh Pia von Korn, Hanna Sydow, Sarah Neubauer, André Duvinage, Anja Mocek, Sophia Dinges, Bjoern Hackenberg, Mario Weichenberger, Volker Amelung, Stephan Mueller