Treatment of pulmonary arterial hypertension (PAH): updated recommendations of the cologne consensus conference 2011 - Ghofrani, Hossein Ardeschir; Distler, Oliver; Gerhardt, Felix; Gorenflo, Matthias; Grünig, Ekkehard; Haefeli, Walter E.; Held, Matthias; Hoeper, Marius M.; Kähler, Christian M.; Kaemmerer, Harald; Klose, Hans; Köllner, Volker; et al. (International journal of cardiology, 2011)