First postnatal lactate blood levels on day 1 and outcome of preterm infants with gestational age <29 weeks oleh Stephanie Zipf, Ingmar Fortmann, Christoph Härtel, Oliver Andres, Eric Frieauff, Pia Paul, Anna Häfke, Heiko Reutter, Patrick Morhart, Ursula Weller, Amrei Welp, Henry Kipke, Egbert Herting, Alexander Humberg, Wolfgang Göpel, Kathrin Hanke