1. From Research Center for Bioelectromagnetic Interaction, Institute of Occupational Medicine (D.S., T.S., S.J., S.D., T.K.), and Department of Internal Medicine I (Cardiology, Angiology, Pneumology and Internal Intensive Care Medicine) (M.D.Z., N.M., A.N.), University Hospital, RWTH Aachen University, Germany; and German Social Accident Insurance Institution for Energy, Textile, Electrical and Media Products Sector (BG ETEM), Köln, Germany (S.J.).