Incidence and outcome of weaning from mechanical ventilation according to new categories - Funk, G-C; Anders, S; Breyer, M-K; Burghuber, O C; Edelmann, G; Heindl, W; Hinterholzer, G; Kohansal, R; Schuster, R; Schwarzmaier-D Assie, A; Valentin, A; Hartl, S (Eur Respir J, 2010)