1 Department of Medical Genetics, Oslo University Hospital, Oslo, Norway.
2 Department of Medical Genetics, Telemark Hospital Trust, Skien, Norway.
3 Department of Radiology, Oslo University Hospital, Oslo, Norway.
4 Norwegian National Unit for Diagnostics of Congenital Metabolic Disorders, Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.
5 TAKO-centre (National Resource Centre for Oral health in Rare Disorders), Lovisenberg Diaconal Hospital, Oslo, Norway.