1. Faculty of Pharmacy, University of Iceland, Hagi, Hofsvallagata 53, IS-107 Reykjavik, Iceland, Decode Genetics Inc., Reykjavik, Iceland, Department of Clinical Microbiology, Landspitali University Hospital, IS-101 Reykjavik, Iceland, and Institute of Biology, University of Iceland, Hagi, Hofsvallagata 53, IS-107 Reykjavik, Iceland