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IEEE Communications Magazine > 2017 > 55 > 5 > 198 - 204
IEEE Communications Surveys & Tutorials > 2016 > 18 > 2 > 1228 - 1240
IEEE Communications Magazine > 2015 > 53 > 1 > 64 - 70
IEEE Journal of Biomedical and Health Informatics > 2013 > 17 > 1 > 9 - 18