Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleClinical Knowledge from Observational Studies. Everything You Wanted to Know but Were Afraid to Ask.AuthorsGershon, Andrea S; Jafarzadeh, S Reza; Wilson, Kevin C; Walkey, Allan JPublicationAmerican Journal of Respiratory & Critical Care Medicine, 2018, Vol 198, Issue 7, p859ISSN1073-449XPublication typejournal articleDOI10.1164/rccm.201801-0118PP