@article{abdullayev_uludag_celik_2019,  title={Analgesia Nociception Index: assessment of acute postoperative pain},  volume={69},  ISSN={0034-7094},  url={https://doi.org/10.1016/j.bjane.2019.03.002},  DOI={10.1016/j.bjane.2019.03.002},  number={4},  journal={Revista Brasileira de Anestesiologia},  publisher={Sociedade Brasileira de Anestesiologia},  author={Abdullayev, Ruslan and Uludag, Oznur and Celik, Bulent},  year={2019},  month={Jul},  pages={396–402} }