@article{Elizabeth S. Klings_Elliott P. Vichinsky_Claudia R. Morris_2014, place={Pavia, Italy}, title={Response to “Efficacy and safety of sildenafil for the treatment of severe pulmonary hypertension in patients with hemoglobinopathies: results from a long-term follow up ” Haematologica 2014;99(2):e17–18.}, volume={99}, url={https://haematologica.org/article/view/6947}, DOI={10.3324/haematol.2013.099861}, number={2}, journal={Haematologica}, author={Elizabeth S. Klings and Elliott P. Vichinsky and Claudia R. Morris}, year={2014}, month={Feb.}, pages={e19-e19} }