1. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm; Germany
2. Division of Population Health Sciences and Education; St George's University of London; London; UK
3. University Children's Hospital; LMU Munich; Munich; Germany
4. 1st Department of Paediatrics, Allergology and Cardiology; Wroclaw Medical University; Wroclaw; Poland
5. Department of Pediatrics and Adolescents; Division of Cardiology and Pulmonology; Innsbruck Medical University; Innsbruck; Austria
6. Division of Environmental Epidemiology; Institute for Risk Assessment Sciences (IRAS); Utrecht University; Utrecht; The Netherlands