An electrode of a pacemaker is pictured with a three-dimensional printout of a human heart at the Klaus-Tschira-Institute for Integrative Computational Cardiology, department of the Heidelberg University Hospital (Universitaetsklinikum Heidelberg), in Heidelberg, Germany, August 14, 2018. Picture taken August 14, 2018. To match Insight HEALTHCARE-MEDICAL TECHNOLOGY/AI REUTERS/Ralph Orlowski