Additional file 1: of ONS: an ontology for a standardized description of interventions and observational studies in nutrition VitaliFrancesco LombardoRosario RiveroDamariz MattiviFulvio FranceschiPietro BordoniAlessandra TrimignoAlessia CapozziFrancesco FeliciGiovanni TaglinoFrancesco MigliettaFranco De CockNathalie LachatCarl BaetsBernard De De TrÊGuy PinartMariona NimptschKatharina PischonTobias BouwmanJildau CavalieriDuccio 2018 Agile introduction on ontologies, how to use them and contribute to ONS. (PDF 2119 kb)