@article{mujtaba_ledingham_shah_clark_pillay_schueler_2018,  title={Early Clinical Results of Perceval Sutureless Aortic Valve in 139 Patients: Freeman Experience},  volume={33},  ISSN={0102-7638},  url={https://doi.org/10.21470/1678-9741-2017-0087},  DOI={10.21470/1678-9741-2017-0087},  number={1},  journal={Brazilian Journal of Cardiovascular Surgery},  publisher={Sociedade Brasileira de Cirurgia Cardiovascular},  author={Mujtaba, Syed Saleem and Ledingham, Simon and Shah, Asif Raza and Clark, Stephen and Pillay, Thasee and Schueler, Stephan},  year={2018},  month={Jan},  pages={8–14} }