Duijts, L.

infection study month birth tract infections infant breastfeeding pregnancy lymphocyte tract birth weight lymphocytes 6 months subset weight smoking lymphocyte subsets generation r study factor count children effect blood pneumococcal carriage association disease growth delivery women cohort trachomati risk factors carriage mother number 4 months neonate preterm pneumococcal outcome period health duration lymphocyte subset counts generation symptom postnatal period chapter trachomatis infection postnatal breastfed reference difference preterm birth day care attendance pediatrics igf-i sample t lymphocyte subsets cohort study chlamydia group preterm delivery result pregnancy outcomes memory table infancy urogenital symptoms epidemiol information otitis media tract infection development 192- bp allele score questionnaire p-value t lymphocytes prevalence