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©Charilaos Lygidakis, Paul Wallace, Costanza Tersar, Francesco Marcatto, Donatella Ferrante, Roberto Della Vedova, Francesca Scafuri, Emanuele Scafato, Pierluigi Struzzo. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 04.03.2016.
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