2.1 Structured questionnaire
The questionnaire included an explanatory cover letter reporting the aim of the Survey. Experts designed the questions in the field (SM, AL, GLM, EC).
The structured questionnaire was prepared as a specific form to be fulfilled online (closed- and open-ended format questions) on the website. Responses were anonymous, but professional information (university paediatrician, hospital paediatrician, primary care paediatrician, or pediatric resident) was requested. The questionnaire included ten questions in a multiple-choice format. Specifically, the questionnaire contained questions on diagnostic criteria, diagnostic and therapeutic management of bronchiolitis in infants and children younger than 24 months of age. One or more answers for each question were provided.
The survey was administered in Italian and translated into English for publication. The English version of the questionnaire is enclosed in Appendix A.