Francesco M Galassi1, Frank J Rühli2. 1. Institute of Evolutionary Medicine (IEM), University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland. francesco.galassi@iem.uzh.ch. 2. Institute of Evolutionary Medicine (IEM), University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland.