DOI: 10.1055/s-00030576

Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics

References

Victora CG, Huttly SR, Fuchs SC, Olinto MT.
The role of conceptual frameworks in epidemiological analysis: a hierarchical approach.

Int J Epidemiol 1997;
26 (01) 224-227
DOI: 10.1093/ije/26.1.224.

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