title: Editorial: observational studies, time-dependent confounding, and marginal structural models.
authors.affiliation: University of California, San Francisco.
authors.forename: Charles E
authors.initials: CE
authors.lastname: McCulloch
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use*; D002807:Chondroitin / Q000627:therapeutic use*; D019587:Dietary Supplements; D005260:Female; D005944:Glucosamine / Q000627:therapeutic use*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D020370:Osteoarthritis, Knee / Q000188:drug therapy*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002807:Chondroitin; D005944:Glucosamine