1. COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital University of Copenhagen Gentofte Denmark
2. Section of Chemometrics and Analytical Technologies, Department of Food Science University of Copenhagen Frederiksberg C Denmark
3. Section for Clinical Mass Spectrometry, Danish Center for Neonatal Screening, Department of Congenital Disorders Statens Serum Institut Copenhagen Denmark