@article{gallo_santana_marcolin_quintana_2014,  title={Swiss ball to relieve pain of primiparous in active labor},  volume={15},  ISSN={1806-0013},  url={https://doi.org/10.5935/1806-0013.20140054},  DOI={10.5935/1806-0013.20140054},  number={4},  journal={Revista Dor},  publisher={Sociedade Brasileira para o Estudo da Dor},  author={Gallo, Rubneide Barreto Silva and Santana, Licia Santos and Marcolin, Alessandra Cristina and Quintana, Silvana Maria},  year={2014},  month={Oct},  pages={253–255} }