Asthma--Environmental aspectsAllergy in childrenIndoor air pollution--Health aspectsAtmospheric nitrogen dioxide--Physiological effectEpidemiologyEnvironmental health
EpidemiologyEpidemiology--Statistical methodsBirth weight, Low--Risk factorsSmoking--Health aspectsCigarette smoke--Health aspectsMedical statisticsNational Center for Health Statistics (U.S.)
Public healthWorld healthDevelopmental neurobiologyPregnant women--Health and hygieneFetus--GrowthNewborn infants--DevelopmentBirth weightDietary supplementsAnemia in pregnancyWorld Health Assembly