Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.|Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.