Caminante no hay camino, se hace camino al andar.
Saracci
Rodolfo
R
IFC- National Research Council, Pisa, Italy. saracci@hotmail.com
D004467:Economics; D004813:Epidemiology / Q000266:history*; D014943:Global Health; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D012935:Social Justice