Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleObservational studies: why are they so important?AuthorsWasum Mariani, Alessandro; Pêgo-Fernandes, Paulo ManuelPublicationSao Paulo Medical Journal, 2014, Vol 132, Issue 1, p1ISSN1516-3180Publication typeArticleDOI10.1590/1516-3180.2014.1321784