Table 1

Survey schedule of INITIAL study

Age of child (months)/separate surveys<1½35 and 7121624, 36 and 4860
Informed consentXX
Family background (confounder)X
Decision-makingXX
Vaccination and health status (group definition, confounder, endpoints)XXXXXX
Allergy questionnaire (endpoints)XXX
Closing—family background (confounder)X
Optional: further laboratory investigations(X)