Additional file 1: of Photodynamic therapy with Bixa orellana extract and LED for the reduction of halitosis: study protocol for a randomized, microbiological and clinical trial GonçalvesMarcela da MotaAna DeanaAlessandro GuedesGuelton CavalcanteLisyanne Araújo de Souza PratesRenato HorlianaAnna PavaniChristiane MottaLara BitencourtGreice de Brito FernandesKristianne SalgueiroMonica da Consolação Canuto Mesquita-FerrariRaquel da SilvaDaniela FrançaCristiane BussadoriSandra 2018 SPIRIT 2013 checklist: recommended items to address in a clinical trial protocol and related documents. (DOC 121 kb)