Information needed for optimal immunization related to medical advice: an observational prospective cohort study protocol (INFORMed).

Introduction: Today, accessing information on health issues is easier than ever. However, the flood of information can make decision-making difficult. Information can influence the intention for an action, yet the action often remains unpredictable.

Infants' immunisations, their timing and the risk of allergic diseases (INITIAL): an observational prospective cohort study protocol.

Introduction: Vaccinations are considered to have a large impact on disease control, hence a multitude of vaccines in infancy is recommended. Retrospective studies suggest a possible relation between timing, kind or number of vaccines given in the first year of life and the subsequent incidence of allergic diseases. It must be clarified whether a causal relationship exists to ensure safety and reduce vaccine hesitancy.