TY - JOUR AU - Helmberger, M; Pienn, M; Urschler, M TI - Quantification of tortuosity and fractal dimension of the lung vessels in pulmonary hypertension patients JO - PLoS One VL - 9 PY - 2014 DO - 10.1371/journal.pone.0087515 SP - e87515 N1 - et al. ER -