1 Institute for Public Health and Nursing Research, University of Bremen, 28359 Bremen, Germany; Health Sciences Bremen, University of Bremen, 28359 Bremen, Germany. Electronic address: ansgar.gerhardus@uni-bremen.de.
2 School of Public Health, Bielefeld University, Bielefeld, Germany.
3 Department of Prevention and Evaluation, Leibniz Institute for Prevention Research and Epidemiology, BIPS, Bremen, Germany; Health Sciences Bremen, University of Bremen, 28359 Bremen, Germany.