I would like to thank the Social Medicine Institute of the State University of Rio de Janeiro, for the research leave that made this project possible. Also, special thanks to  Utrecht University for practical support and for the kind reception they provide me. Last but not least, thanks to Toine Pieters, who was optimistic about this project since the beginning and supportive many times; to Arjan van Hessen, who taught me patiently how to deal with new gadgets and sound waves. And thanks to Washington Junger, whose stimulus to work on this website despite all the difficulties in Brazil probably made this site possible.

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