1. Unit of Pediatric Allergy and Respiratory Medicine, Women's and Children's Health Department University of Padova Padova Italy
2. Pediatric Unit – IRCCS Azienda Ospedaliero‐Universitaria di Bologna Bologna Italy
3. Pediatric Clinic, Fondazione IRCSS Policlinico San Matteo University of Pavia Pavia Italy
4. Allergy Unit Meyer Paediatric University Hospital Florence Italy
5. Pediatric Unit, Department of Obstetrics, Gynecology and Pediatrics Azienda USL – IRCCS Reggio Emilia Italy
6. Pediatric Allergology Unit, Maternal and Child Department and Urological Science Umberto I Hospital, Sapienza University Rome Italy
7. Pediatric Pulmonology & Respiratory Intermediate Care Unit, Sleep and long term Ventilation Unit, Academic Department of Pediatrics (DPUO) Bambino Gesù Children's Hospital, IRCCS Rome Italy
8. Pulmonary Unit Meyer Paediatric University Hospital Florence Italy
9. Mass Spectrometry and Metabolomic Laboratory, Women's and Children's Health Department University of Padova Padova Italy
10. Fondazione Istituto di Ricerca Pediatrica (IRP) Padova Italy
11. Pediatric Unit, Department of Mother and Child Health Salesi Children's Hospital Ancona Italy
12. Department of Mother and Child Health Azienda USL Toscana Nord Ovest Pisa Italy