Sonnenschein-Voort, A.M.M. van der

month breastfeeding asthma ptrend asthma-related symptoms symptom children effect study asthma-related breastfed duration 4 yrs atopy model 4 months association sonnenschein-van der voort tract infections childhood breastfeeding duration history infection birth exclusiveness analyses 3–6 effect estimates daycare attendance asthma-related symptom cohort information breath number cough shortness 0–3 phlegm <0.001 eczema 0.0 1.0 birth weight allergy european tract estimate 0.5 1.5 smoking generation r study 2.0 result smoking habits rotterdam ethnicity confounder table journal asthmarelated symptoms daycare sonnenschein-van atopic volume voort netherland attendance a.m.m birth cohort study trend weight parity infant analysis 2 yrs childhood asthma development mechanism education erasmu