@article{lange_zétola_piovesan_werneck_2010,  title={Valsalva maneuver procedures in the diagnosis of right-to-left shunt by contrast-enhanced transcranial doppler using agitated saline solution with blood as a contrast agent},  volume={68},  ISSN={0004-282X},  url={https://doi.org/10.1590/S0004-282X2010000300016},  DOI={10.1590/S0004-282X2010000300016},  number={3},  journal={Arquivos de Neuro-Psiquiatria},  publisher={Academia Brasileira de Neurologia - ABNEURO},  author={Lange, Marcos Christiano and Zétola, Viviane Flumignan and Piovesan, Elcio Juliato and Werneck, Lineu César},  year={2010},  month={Jun},  pages={410–413} }