1. Nofima AS, Osloveien 1, 1430 Ås, Norway
2. Institute of Mathematical Sciences and Technology, Norwegian University of Life Sciences, P.O. Box 5003, 1432 Ås, Norway
3. Centre for Integrative Genetics (CIGENE), Department of Mathematical Sciences and Technology (IMT), Norwegian University of Life Sciences, 1432 Ås, Norway