De Jesús-Berrios, Yohana, et al. “Usefulness of the Culturally Adapted Oxygen-Cost Diagram in the Assessment of Dyspnea in Puerto Rico”. Puerto Rico Health Sciences Journal, vol. 34, no. 1, Feb. 2015, https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/996.