Pulmonary vascular changes in extremely preterm sheep after intra-amniotic exposure to Ureaplasma parvum and lipopolysaccharide. oleh Monique G M Willems, Matthew W Kemp, Laura A Fast, Nick M M Wagemaker, Leon E W Janssen, John P Newnham, Matt S Payne, Owen B Spiller, Suhas G Kallapur, Alan H Jobe, Tammo Delhaas, Boris W Kramer, Tim G A M Wolfs