behandelingsmethoden congresses environmentalaspects environmentalexposure environmentalhazards environmentalhealth environmentalhealthsciences frühgeburt hazardoussubstances infant kurs labor medical neonatal neonatology nursing partusimmaturus pediatric perinatology premature prematurebirth prematureinfants prematurelabor umweltfaktor wq330p9421981 wq330r7452003 ym7105