Interpretation of observational studies.
Jepsen
P
P
Department of Clinical Epidemiology, Aarhus University Hospital, Vennelyst Boulevard 6, 8000 Aarhus C, Denmark. pj@soci.au.dk
Johnsen
S P
SP
Gillman
M W
MW
Sørensen
H T
HT
D015982:Bias; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D019370:Observation; D012107:Research Design