Wouden, J.C. van der

children study asthma practice student research questionnaire baseline 0.0 symptom teacher therapist supervisor complaint attitude quality knowledge behaviour nitric oxide group measurement 2 years weight asthma symptoms hdm-specific ige trainee activity patient score oxide nitric level therapy gp trainee question medicine netherland non-overweight children evidence-based journal correlation population evidence obesity control child table hdm-specific follow-up value doerak airway parent result feno levels allergy waist circumference health gp trainees month diary 11.1 university participant ebm knowledge doerak cohort study airway inflammation doerak questionnaire therapy students cohort non-overweight intention survey difference skill database waist rhiniti circumference dutch