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parent study trial consent child reason children future consent form participation information procedure seizure consent procedure disadvantage trial characteristics characteristic advantage future study table approval research questionnaire benefit awareness west european origin willingness investigator level side evects european diycult participant randomised non-west european parents future studies placebo science study medication sociodemographic percentage origin consent forms ibuprofen education centraal bureau voor hospital article number paediatric evect suycient question invitation understanding patient suycient time study characteristics sociodemographic status adc.bmj.com december medication contribution downloaded stuijvenberg result recurrence father group marja h suur steyerberg fever status non-west derksen-lubsen feeling sophia children adult 24 hours ibuprofen syrup