@article{paliwal_sharma_2010,  title={Valsalva maneuver in detection of right-to-left shunt by transcranial Doppler},  volume={68},  ISSN={0004-282X},  url={https://doi.org/10.1590/S0004-282X2010000600034},  DOI={10.1590/S0004-282X2010000600034},  number={6},  journal={Arquivos de Neuro-Psiquiatria},  publisher={Academia Brasileira de Neurologia - ABNEURO},  author={Paliwal, Prakash R. and Sharma, Vijay K.},  year={2010},  month={Dec},  pages={979–979} }