1. Faculty of Medicine, University of Iceland and Landspítali–The National University Hospital of Iceland, Reykjavík, Iceland (A.B.I., A.S.Á., P.T.Ö., E.S.B.)
2. University of Gothenburg and Sahlgrenska Academy, Gothenburg, Sweden (J.P.H.)
3. deCODE genetics, Reykjavík, Iceland (S.H.L.)
4. Faculty of Medicine, University of Iceland, Reykjavík, Iceland (E.R., D.A.P.)
5. Primary Health Care of the Capital Area, Reykjavík, Iceland (I.E.R.)
6. Landspítali–The National University Hospital of Iceland, Reykjavík, Iceland (B.R.G.).