[1] Univ Oslo, Rikshosp, Oslo Univ Hosp, Inst Internal Med, N-0027 Oslo, Norway
[2] Oslo Univ Hosp, Deparment Neurol, Oslo, Norway
[3] Norwegian Univ Sci & Technol, Dept Canc Rsch & Mol Med, N-7034 Trondheim, Norway
[4] Oslo Univ Hosp, Dept Thorac & Cardiovasc Surg, Oslo, Norway
[5] Oslo Univ Hosp, Inst Internal Med, Oslo, Norway