Impact of physicians’ participation in non-interventional post-marketing studies on their prescription habits: a retrospective 2-armed cohort study in Germany - Koch, Cora; Schleeff, Jörn; Techen, Franka; Wollschläger, Daniel; Schott, Gisela; Kölbel, Ralf; Lieb, Klaus (Public Library of Science (PLoS), 2020)