Table 1. Search strategy for PubMed.

(Child [TIAB] OR Children [TIAB] OR Childhood [TIAB] OR newborn [TIAB] OR infant [TIAB] OR newborn [MH] OR infant [MH] OR child [MH])

AND

(“birth-cohort” [TIAB] OR birth* [TIAB] OR “Prospective-study” [TIAB] OR “longitudinal study” [TIAB] OR “follow-up study”[TIAB] OR cohort* [TIAB] OR “Birth cohort study” [TIAB]OR “cohort studies”[MH])

AND

(“respiratory-tract-infection” [TIAB] OR“Infectious diseases” [TIAB] OR “Infection diseases” [TIAB] OR “communicable diseases” [TIAB] OR “respiratory infections” [TIAB] OR “virology” [TIAB] OR “immunology” [TIAB] OR “virus disease” [TIAB] OR “viral disease” [TIAB] OR “infectious” [TIAB] OR “bacterial infection” [TIAB] OR “infections” [TIAB] “respiratory tract infections"[MH]"communicable diseases"[MH] OR “virology"[MH] OR “allergy and immunology"[MH] OR" virus diseases"[MH] OR "bacterial infections"[MH] OR "infection"[MH])

AND

(“Daily-diary-study” [TIAB] OR Diary [TIAB] OR “daily-diary” [TIAB] OR “daily-diaries” [TIAB] OR “daily-observation” [TIAB] OR “daily- records” [TIAB] OR “self-reported-Questionnaire”[TIAB] OR “Symptom records”[TIAB] OR “Symptom questionnaire”[TIAB]OR “Symptom diary” [TIAB] OR “Symptom diaries” [TIAB])