Prescribing and adjusting exercise training in chronic respiratory diseases ¿ Expert-based practical recommendations R. Gloeckl; R.H. Zwick; U. Fürlinger; I. Jarosch; T. Schneeberger; D. Leitl; A.R. Koczulla; K. Vonbank; C. Alexiou; I. Vogiatzis; M.A. Spruit;