Acute Cellular Rejection Is a Risk Factor for Bronchiolitis Obliterans Syndrome Independent of Post-transplant Baseline FEV1 - Burton, Christopher M.; Iversen, Martin; Carlsen, Jørn; Mortensen, Jann; Andersen, Claus B.; Steinbrüchel, Daniel; Scheike, Thomas (Journal of Heart & Lung Transplantation, 2009)