1. Institute of Human Genetics, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany.
2. Department of Human Genetics, University of Würzburg, Würzburg, Germany.
3. Leeds Institute of Molecular Medicine, St. James's University Hospital, Leeds, UK.
4. Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
5. Institut für Humangenetik und Anthropologie, Heinrich-Heine-Universität, Düsseldorf, Germany.