Francesco M Galassi1, Michael E Habicht2, Frank J Rühli2. 1. Institute of Evolutionary Medicine, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland. francesco.galassi@iem.uzh.ch. 2. Institute of Evolutionary Medicine, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.