Center for Systems Biology, University of Iceland, Sturlugata 8, Reykjavik, Iceland. Medical Department, University of Iceland, Sturlugata 8, Reykjavik, Iceland. The Blood Bank, Landspitali-University Hospital, Snorrabraut 60, Reykjavik, Iceland. School of Science and Engineering, Reykjavik University, Menntavegur 1, Reykjavik, Iceland.