1. Department of Environmental Health; National Institute for Health and Welfare; Kuopio; Finland
2. Department of Vaccination and Immune Protection; National Institute for Health and Welfare; Helsinki; Finland
3. Department of Obstetrics and Gynecology; Kuopio University Hospital; Kuopio; Finland
4. Institute for Laboratory Medicine and Pathobiochemistry; Molecular Diagnostics; Philipps-University of Marburg; Germany
5. Children and Young Adults' Medicine; Children's Hospital; Schwarzach; Austria
6. Institute of Epidemiology and Medical Biometry; University of Ulm; Ulm; Germany
7. Christine Kühne-Center for Allergy research and Education; Hochgebirgklinik Davos; Davos-Wolfgang; Switzerland
8. Dr. von Hauner Children's Hospital of the Ludwig Maximilian University Munich; Munich; Germany