title: [Studying rare outcomes].
authors.affiliation: johan.reutfors@ki.se
authors.forename: Johan
authors.initials: J
authors.lastname: Reutfors
authors.forename: Ola
authors.initials: O
authors.lastname: Olén
authors.forename: Cecilia
authors.initials: C
authors.lastname: Magnusson
authors.forename: Andreas
authors.initials: A
authors.lastname: Pettersson
mesh_terms: D015982:Bias; D035843:Biomedical Research / Q000592:standards*; D016022:Case-Control Studies; D016017:Odds Ratio; D035583:Rare Diseases; D012107:Research Design / Q000592:standards*; D018401:Sample Size