[1] Univ Oslo, Dept Nutr, N-0316 Oslo, Norway
[2] Uppsala Univ, Rudbeck Lab, Dept Genet & Pathol, SE-75185 Uppsala, Sweden
[3] Norwegian Inst Publ Hlth, N-0403 Oslo, Norway
[4] Univ Tras os Montes & Alto Douro, Genet & Biotechnol Dept, P-5000 Vila Real, Portugal
[5] Severn Biotech Ltd, Unit 2, Kidderminster DY11 6TJ, Worcs, England