Developing Pulmonary Rehabilitation for COVID-19: Are We Linked with the Present Literature? A Lexical and Geographical Evaluation Study Based on the Graph Theory. - Fusco, Augusto; Padua, Luca; Coraci, Daniele; Loreti, Claudia; Castelli, Letizia; Costantino, Cosimo; Frizziero, Antonio; Serafini, Elisabetta; Biscotti, Lorenzo; Bernabei, Roberto; Giovannini, Silvia (Journal of Clinical Medicine, 2021)