Universitat Autònoma de Barcelona (UAB), Pediatric Asthma and Cough Center, Istituti Ospedalieri Bergamaschi, Charles Darwin University - Menzies School of Health Research, University of the Witwatersrand - Vaccines and Infectious Diseases Analytics Research Unit, University of KwaZulu-Natal - Department of Paediatrics and Child Health, University of Cape Town (UCT) - Department of Pediatrics and Child Health, University of Pretoria, Marmara University, Marmara University - Department of Pediatric Pulmonology, Marmara University, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, Universitat Autònoma de Barcelona (UAB), Sapienza University of Rome - Department of Maternal, Infantile, and Urological Sciences, Sapienza University of Rome - Department of Maternal, Infantile, and Urological Sciences, University of Pisa, National Pirogov Memorial Medical University, University of Medicine, Tirana - University Hospital Mother Teresa, European Lung Foundation, European Lung Foundation, Queensland University of Technology, Charles Darwin University - Child Health Division and Independent