[1] Univ Oslo, Inst Basic Med Sci, Dept Nutr, POB 1046, N-0316 Oslo, Norway
[2] Oslo Univ Hosp, Lipid Clin, Oslo, Norway
[3] Univ Oslo, Inst Basic Med Sci, Dept Biostat, Oslo Ctr Biostat & Epidemiol, Oslo, Norway
[4] Oslo Univ Hosp, Rikshosp, Norwegian Natl Advisory Unit Familial Hypercholes, POB 4950, Nydalen, Norway