Efficacy of gamification-based smartphone application for weight loss in overweight and obese adolescents: study protocol for a phase II randomized controlled trial by Timpel, Patrick, Cesena, Fernando Henpin Yue, da Silva Costa, Christiane, Soldatelli, Matheus Dorigatti, Gois, Emanuel, Castrillon, Eduardo, Díaz, Lina Johana Jaime, Repetto, Gabriela M., Hagos, Fanah, Castillo Yermenos, Raul E., Pacheco-Barrios, Kevin, Musallam, Wafaa, Braid, Zilda, Khidir, Nesreen, Romo Guardado, Marcela, Roepke, Roberta Muriel Longo

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