1. Section of Microbiology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
2. Department of Technological Educations, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
3. Danish Archaea Centre, Department of Biology, University of Copenhagen, University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen, Denmark
4. Philipps-Universität Marburg, Faculty of Biology, Hans-Meerwein-Straße 6, 35032 Marburg, Germany
5. Copenhagen Prospective Studies on Asthma in Childhood (COPSAC), Herlev and Gentofte Hospital, University of Copenhagen, Ledreborg Alle 34, 2820 Gentofte, Denmark