[1] Akershus Univ Hosp, Dept Multidisciplinary Lab Med & Biochem, Div Diagnost & Technol, Genet Unit, N-1478 Nordbyhagen, Norway
[2] Akershus Univ Hosp, Dept Child & Adolescent Med, N-1478 Nordbyhagen, Norway
[3] Akershus Univ Hosp, Dept Microbiol & Infect Control, Div Diagnost & Technol, Genet Unit, N-1478 Nordbyhagen, Norway
[4] Univ Oslo, Inst Clin Med, Oslo, Norway