1. Princess Amalia Children's Centre; Isala Hospital; Zwolle the Netherlands
2. Pediatric Respiratory and Allergy Units; ‘Virgen de la Arrixaca’ University Children's Hospital; University of Murcia; Murcia Spain
3. Arrixaca Bio-Health Research Institute of Murcia; Murcia Spain
4. Department of Pediatric Respiratory Medicine; Hospital El Pino; University of Santiago de Chile (USACH); Santiago Chile
5. Division of Allergy, Clinical Immunology and Rheumatology; Department of Pediatrics; Federal University of São Paulo (UNIFESP); São Paulo Brazil
6. UMCG Postgraduate School of Medicine; University Medical Centre and University of Groningen; Groningen the Netherlands