Atraumatic Restorative Treatment compared to the Hall Technique for occluso-proximal cavities in primary molars: study protocol for a randomized controlled trial - Hesse, Daniela; Araujo, Mariana Pinheiro de; Olegário, Isabel Cristina; Innes, Nicola; Raggio, Daniela Prócida; Bonifácio, Clarissa Calil (Trials, 2016)