Increase in immune activation, vascular endothelial growth factor and erythropoietin after an ultramarathon run at moderate altitude. - Schobersberger,W.; Hobisch-Hagen,P.; Fries,D.; Wiedermann,F.; Rieder-Scharinger,J.; Villiger,B.; Frey,W.; Herold,M.; Fuchs,D.; Jelkmann,W. (Immunobiol, 2000)