1. Department of Cell Biology, Histology and Embryology, Gottfried Schatz Research Center, Medical University of Graz, Neue Stiftingtalstrasse 6/II, Graz, Austria
2. Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
3. Department of Obstetrics and Gynecology, Department of Anatomy and Cell Biology, Wayne State University School of Medicine, Detroit, MI, USA