"wetenschappelijk artikel"@nl . "article scientifique publi\u00E9 en 2007"@fr . . "17" . "10.1056/NEJMP078038" . "Challenges in using observational studies to evaluate adverse effects of treatment"@nl . . . "17460224" . . . . "scientific article published on 01 April 2007"@en . "Challenges in using observational studies to evaluate adverse effects of treatment"@en . . . "Challenges in using observational studies to evaluate adverse effects of treatment"@en . . . "Challenges in using observational studies to evaluate adverse effects of treatment"@nl . "Challenges in using observational studies to evaluate adverse effects of treatment"@en . "356" . "Challenges in using observational studies to evaluate adverse effects of treatment"@nl . . . . . . "Challenges in using observational studies to evaluate adverse effects of treatment"@en . "1705-1707" . "art\u00EDculu cient\u00EDficu espubliz\u00E1u n'abril de 2007"@ast . "Michael D Hughes" . "\u043D\u0430\u0443\u043A\u043E\u0432\u0430 \u0441\u0442\u0430\u0442\u0442\u044F, \u043E\u043F\u0443\u0431\u043B\u0456\u043A\u043E\u0432\u0430\u043D\u0430 \u0443 \u043A\u0432\u0456\u0442\u043D\u0456 2007"@uk . . . . "2007-04-01T00:00:00Z"^^ . .