Exposure to Environmental Microorganisms and Childhood AsthmaMarkus Ege(St Mark's Hospital), Erika von Mutius(Uniwersytecki Szpital Dziecięcy)New England Journal of MedicineFebruary 23, 201110.1056/nejmoa1007302Cited by 1,522SaveCiteExport RISWatch citationsRelated PapersRoad traffic and adverse effects on respiratory health in children.|BMJ|1993|418